Coating composition, UV light conversion coating and preparation method thereof, photovoltaic cell and photovoltaic module

Abstract

The present invention relates to a coating composition for forming a UV light conversion coating for a photovoltaic cell, a UV light conversion coating prepared using the coating, a method for preparing the UV light conversion coating, and a photovoltaic cell and a photovoltaic module including the coating. The coating composition includes, by mass: 180-250 parts of a di(meth)acrylate component that is liquid at room temperature, which is a di(meth)acrylate of one or more aliphatic dihydroxy compounds; 66-100 parts of a mono(meth)acrylate component that is liquid at room temperature, which is a (meth)acrylate of one or more aliphatic monohydroxy compounds; 6-16 parts of a free radical initiator; 3-5 parts of a UV light converter; and 0-200 parts of an inert diluent. By using a light conversion coating prepared by the coating composition in a photovoltaic cell or a photovoltaic module, the transmittance of UV band light can be reduced and the transmittance of visible light wavelengths can be increased), thereby improving light conversion efficiency.

Description

Technical Field

[0001] The present invention generally relates to the field of photovoltaic cells, and in particular to a coating composition for forming a UV light conversion coating for a photovoltaic cell, a UV light conversion coating prepared using the coating, a method for preparing the UV light conversion coating, and a photovoltaic cell and a photovoltaic module comprising the coating. Background Art

[0002] With the consumption of traditional fossil energy and the deterioration of the ecological environment for human survival, clean renewable energy such as solar energy, wind energy, and hydropower have long been highly valued by the world. Among them, solar energy, with its inexhaustible characteristics and advantages, can be said to be the best choice for mankind to solve the energy shortage problem in the 21st century. The core components of photovoltaic power generation are photovoltaic cells and modules. The goal is to continuously improve the power conversion efficiency of battery modules and reduce the cost of power generation, so as to ultimately achieve grid parity.

[0003] The spectrum of sunlight ranges from 300nm to 2400nm, and can generally be divided into ultraviolet light, visible light, and infrared light. Ultraviolet light (UV) is a general term for radiation with a frequency of 750THZ-30PHz in the electromagnetic spectrum and a wavelength of 380nm-10nm in a vacuum. When sunlight is incident on a photovoltaic cell module, due to the limitation of the photovoltaic cell material itself on the response to the wavelength of light, it can only absorb a portion of light of a specific wavelength, and the shorter UV wavelength cannot be absorbed and converted into electricity, so that the photovoltaic cell cannot effectively utilize the entire spectrum. Based on the structural characteristics of existing cells, such as HJT, TOPCon, and BC cells, short-wavelength ultraviolet light is destructive to the passivation layer of the cell, thereby reducing the efficiency and service life of the cell.

[0004] Recently, a technology developed to improve the efficiency of photovoltaic devices is to use wavelength down-shifting films, also known as wavelength conversion films, light conversion films or light transfer films. The wavelength down-shifting film can absorb photons of shorter wavelengths and re-emit them at more favorable longer wavelengths, which can then be absorbed by the photoconductive layer in the device and converted into electricity. Since the wavelength down-shifting film can convert the wavelength band of the incident light in which the photovoltaic cell responds poorly (low quantum efficiency) into the wavelength band with better response (high quantum efficiency), it mainly changes the ultraviolet light in the sunlight into usable red and blue light, thereby achieving the maximum utilization of sunlight without changing the structure of the photovoltaic cell itself, thereby increasing the unit power generation.

[0005] The light conversion film is usually prepared by mixing a polymer matrix, a light conversion agent and various other additives; and the light conversion efficiency and other properties of the light conversion film are mainly improved by improving the light conversion agent (see, for example, CN103415589A, CN117431022A), or by changing the combination of the polymer matrix, the light conversion agent and various other components for formula design (see, for example, CN114716948A, CN114836136A, CN118165664A).

[0006] Since the performance of the photoconversion layer significantly affects the performance of the photovoltaic cell and photovoltaic module to which it is applied, it is still desired in the art to provide a photoconversion layer with further improved performance including photoconversion efficiency. Summary of the invention

[0007] The present invention is made in view of the above problems existing in the prior art.

[0008] In a first aspect, the present invention provides a coating composition for forming a UV light conversion coating for a photovoltaic cell, comprising, by mass:

[0009] 180-250 parts of a di(meth)acrylate component that is liquid at room temperature, which is a di(meth)acrylate of one or more aliphatic dihydroxy compounds;

[0010] 66-100 parts of a mono(meth)acrylate component that is liquid at room temperature, which is a (meth)acrylate of one or more aliphatic monohydroxy compounds;

[0011] 6-16 parts of a free radical initiator;

[0012] 3-5 parts of UV light converter; and

[0013] 0-200 parts of inert diluent.

[0014] In a second aspect, the present invention provides a UV light conversion coating obtained by free radical polymerization of the coating composition according to the first aspect of the present invention.

[0015] In a third aspect, the present invention provides a method for preparing a UV light conversion coating according to the second aspect of the present invention, which comprises coating the coating composition according to the first aspect of the present invention on a substrate surface, and subjecting the coated coating composition to free radical polymerization.

[0016] In a fourth aspect, the present invention provides a photovoltaic cell comprising a UV light conversion coating according to the second aspect of the present invention formed on a surface of the photovoltaic cell.

[0017] In a fifth aspect, the present invention provides a photovoltaic cell module comprising the UV light conversion coating according to the second aspect of the present invention formed on the inner and / or outer surface of the front glass and / or back glass of the photovoltaic cell module.

[0018] The applicant has found that, compared with the conventional method of mixing a polymer matrix with a photoconverter and then coating the resulting mixture to prepare a photoconverter coating or a photoconverter film, a mixture of a di(meth)acrylate component that is liquid at room temperature and capable of free radical polymerization and a mono(meth)acrylate component that is liquid at room temperature and capable of free radical polymerization and a free radical initiator is used instead of a polymer matrix to mix with a photoconverter to prepare a coating composition, and the coating composition is coated and then subjected to free radical polymerization, and the resulting photoconverter coating can enable the photovoltaic cell or photovoltaic module to which it is applied to more effectively convert UV light into visible light (i.e., reduce the transmittance of UV band light and increase the transmittance of visible light wavelengths), thereby improving the photoconversion efficiency. And in terms of converting UV light into visible light and photoconversion efficiency, the UV light conversion coating of the present invention can still achieve an effect comparable to or even better than that of a conventional photoconverter coating or film even at a lower thickness. DETAILED DESCRIPTION

[0019] In order to make the invention purpose, technical solution and beneficial technical effect of the present application clearer, the present application will be described in detail below. It should be noted that the various aspects, features, implementation methods and advantages described in the present application may be compatible and / or may be combined together.

[0020] Unless otherwise specified, the meanings of the technical terms in this specification are the same as those generally understood by those skilled in the art.

[0021] Those skilled in the art will understand that in the present application, unless otherwise specified, a number containing n significant digits after the decimal point actually also covers the result of rounding a number containing more significant digits after the decimal point to n significant digits after the decimal point. For example, 0.16 actually covers all numbers in the range from greater than or equal to 0.155 to less than 0.165; 0.166 actually covers all numbers in the range from greater than or equal to 0.1655 to less than 0.1665, and so on.

[0022] In the present application, unless otherwise specified, even if the term "about" is not used to modify a numerical value, the numerical value should be understood to be modified by "about" in consideration of the measurement error; the term "about" includes a deviation of ±5% of the stated numerical value, that is, for a numerical value a, whether or not it is modified by "about", it should be understood to represent a range of a±5%a, that is, 0.95a to 1.05a. For example, the number "1" should be understood to specifically disclose the numerical value 1, and also disclose the range of 0.95-1.05.

[0023] In the present application, when the temperature, pressure and atmosphere involved are not specifically stated, the temperature is room temperature (also called normal temperature, i.e., about 25° C.), the pressure is atmospheric pressure, and the atmosphere is atmospheric (air) atmosphere.

[0024] In the present application, the term "(meth)acrylate" has a common meaning in the art and refers to acrylate, methacrylate, or a mixture of the two.

[0025] In the present application, the term "aliphatic" (also called "fatty") includes chain aliphatic and cycloaliphatic (also called cycloaliphatic). Therefore, in the present application, when referring to "aliphatic" compounds, it includes chain aliphatic compounds (i.e. chain aliphatic compounds), cycloaliphatic compounds (i.e. cyclic aliphatic compounds) or mixtures thereof.

[0026] In this application, the terms "UV light conversion coating", "light conversion coating", and "light conversion coating" have the same meaning and are used interchangeably.

[0027] In the present application, the terms "UV light conversion agent", "light conversion agent", "light conversion agent" have the same meaning and are used interchangeably.

[0028] In the present application, the term "inert" means that it does not react with other components in the composition during the preparation of the composition and does not participate in polymerization during the polymerization process. Therefore, in the present application, the term "inert diluent" means a substance that is liquid at room temperature and is used to dilute the composition, thereby reducing its viscosity, and does not react with other components in the coating composition during the preparation of the coating composition and does not participate in polymerization during the polymerization and curing process of the coating composition.

[0029] In the present application, the term "viscosity" refers to dynamic viscosity, and the unit is cP (i.e. centipoise). The viscosity is measured using a Brookfield viscometer (eg, using a CP40 or CP51 spindle) at 5 rpm.

[0030] In the present application, when describing the amount or number of substances, unless otherwise specified, it refers to mass or mass part.

[0031] The present invention relates to a coating composition for forming a UV light conversion coating for a photovoltaic cell, a UV light conversion coating prepared therefrom, a method for preparing the UV light conversion coating, and a photovoltaic cell and a photovoltaic module comprising the UV light conversion coating.

[0032] The present invention will be described in detail below.

[0033] Coating composition

[0034] In a first aspect, the present invention relates to a coating composition for forming a UV light conversion coating for a photovoltaic cell, comprising, by mass:

[0035] 180-250 parts of a di(meth)acrylate component that is liquid at room temperature, which is a di(meth)acrylate of one or more aliphatic dihydroxy compounds;

[0036] 66-100 parts of a mono(meth)acrylate component that is liquid at room temperature, which is a (meth)acrylate of one or more aliphatic monohydroxy compounds;

[0037] 6-16 parts of a free radical initiator;

[0038] 3-5 parts of UV light converter; and

[0039] 0-200 parts of inert diluent.

[0040] The applicant has found that, compared with the conventional method of directly coating a light conversion coating or a light conversion film by using a coating composition prepared by mixing a polymer matrix with a light conversion agent, a coating composition prepared by mixing a di(meth)acrylate component that is liquid at room temperature and capable of free radical polymerization, a mono(meth)acrylate component that is liquid at room temperature and capable of free radical polymerization, and a free radical initiator is used instead of a polymer matrix and a light conversion agent, and the coating composition is coated and then free radical polymerization is performed, and the obtained light conversion coating layer can make the photovoltaic cell or photovoltaic module to which it is applied more effectively convert UV light into visible light (i.e., reduce the transmittance of UV band light and increase the transmittance of visible light wavelengths), thereby improving the light conversion efficiency. And in terms of converting UV light into visible light and light conversion efficiency, the UV light conversion coating of the present invention can still achieve an effect comparable to or even better than that of a conventional light conversion coating or film even at a lower thickness. This is believed to be because the coating composition of the present invention uses relatively small molecular di(meth)acrylate components and mono(meth)acrylate components, whose solubility in the photoconverter is better than the solubility of the high molecular polymer matrix used in the prior art photoconverter film or coating. Moreover, since the di(meth)acrylate component and the mono(meth)acrylate component are liquid at room temperature, they can be mixed with the photoconverter more easily and more evenly. In addition, since the di(meth)acrylate component is used, it acts as a crosslinking agent, so that the coating composition forms a crosslinking structure after curing and polymerization. The crosslinking structure limits the migration and even precipitation of the photoconverter in the system (for example, due to the segment movement of the polymer matrix and the melting of the polymer matrix at high temperature), so that the system remains more uniform and stable, thereby improving the photoconversion performance and life of the photoconverter layer. In addition, the coating composition of the present invention is an acrylate-based system, and the photoconverter coating prepared therefrom can have improved water vapor barrier properties compared to the photoconverter coatings using other types of polymers in the prior art.

[0041] In an embodiment, the coating composition includes a di(meth)acrylate component that is liquid at room temperature, which is one or more di(meth)acrylates of aliphatic dihydroxy compounds. The di(meth)acrylate component can be one di(meth)acrylate of an aliphatic dihydroxy compound (i.e., one diacrylate of an aliphatic dihydroxy compound, one dimethacrylate of an aliphatic dihydroxy compound, or a mixture thereof), or multiple (two or more) di(meth)acrylates of aliphatic dihydroxy compounds (i.e., multiple diacrylates of aliphatic dihydroxy compounds, multiple dimethacrylates of aliphatic dihydroxy compounds, or a mixture thereof).

[0042] The coating composition includes 180-250 parts by mass of the di(meth)acrylate component; for example, the coating composition may include the following amounts of the di(meth)acrylate component: 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221 09, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, or a range limited by any two of them.

[0043] The aliphatic dihydroxy compound may be a polymeric dihydroxy compound, a non-polymeric dihydroxy compound, or a mixture thereof. In one embodiment, the aliphatic dihydroxy compound may, for example, include or be an aliphatic polyurethane diol, an aliphatic polyester diol, an alkylene glycol, an ether glycol derived from an alkylene glycol (e.g., an adduct of an alkylene glycol and an alkylene oxide having a different carbon number from the alkylene glycol (e.g., ethylene oxide, propylene oxide, butylene oxide, etc. or a combination thereof), and / or a polyalkylene oxide diol (also referred to as a polyether glycol) (e.g., an adduct of an alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc. or a combination thereof)). For example, the aliphatic dihydroxy compound may include or be a mixture of: (1) aliphatic polyurethane diol; (2) aliphatic polyester diol; and (3) alkylene glycol, an adduct of alkylene glycol and alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc. or a combination thereof), and / or polyalkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc. or a combination thereof) diol.

[0044] Therefore, in one embodiment, the di(meth)acrylate component may include or be a difunctional aliphatic polyurethane di(meth)acrylate (i.e., a di(meth)acrylate of aliphatic polyurethane diol; hereinafter referred to as component A). The difunctional aliphatic polyurethane di(meth)acrylate (i.e., component A) may be, for example, a difunctional chain aliphatic polyurethane diacrylate (i.e., a diacrylate of a chain aliphatic polyurethane diol), a difunctional cycloaliphatic polyurethane diacrylate (i.e., a diacrylate of a cycloaliphatic polyurethane diol), a difunctional chain aliphatic polyurethane dimethacrylate (i.e., a dimethacrylate of a chain aliphatic polyurethane diol), a difunctional cycloaliphatic polyurethane dimethacrylate (i.e., a dimethacrylate of a cycloaliphatic polyurethane diol), or a mixture thereof. The aliphatic polyurethane diol may be, for example, a polyurethane diol obtained by reacting an aliphatic diisocyanate with an excess of an aliphatic diol. Those skilled in the art will understand that the chain aliphatic polyurethane diol refers to a polyurethane diol obtained by reacting a chain aliphatic diisocyanate with an excess of a chain aliphatic diol; the cycloaliphatic polyurethane diol refers to a polyurethane diol obtained by polymerizing a part or all of the chain aliphatic diisocyanate replaced by alicyclic diisocyanate and / or a part or all of the chain aliphatic diol replaced by cycloaliphatic diol. The aliphatic diisocyanate may, for example, include or be selected from one or more of C6-C20 (e.g., C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, or a range defined by any two of them) diisocyanates, wherein the carbon number includes the carbon in the isocyanate group; for example, it includes or is selected from one or more of the following: dicyclohexylmethane diisocyanate (also known as hydrogenated MDI or HMDI) (e.g., 2,2'-dicyclohexylmethane diisocyanate, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, or a range defined by any two of them) diisocyanates. cyanate, 2,4'-dicyclohexylmethane diisocyanate, 4,4'-dicyclohexylmethane diisocyanate), cyclohexyl diisocyanate (for example 1,4-cyclohexyl diisocyanate such as trans-1,4-cyclohexyl diisocyanate), cyclohexane dimethylene diisocyanate (also known as di(isocyanatomethyl)cyclohexane; for example 1,3-di(isocyanatomethyl)cyclohexane), isophorone diisocyanate, 1,4-diisocyanate butane, 1,12-diisocyanatotridecane or hexamethylene diisocyanate (1,6-hexamethylene diisocyanate). The aliphatic diol may, for example, include or be selected from C2-C20 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, or a range defined by any two of them) diols, such as one or more of C2-C10 diols, for example, include or be selected from the following: ethylene glycol, propylene glycol (e.g., 1,2-propylene glycol, 1,3-propylene glycol, or a combination thereof), butylene glycol (e.g., 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butanediol, 2,3-butanediol, 2-methyl-1,3-propanediol, other chain isomer diols or combinations thereof), pentanediols (e.g., 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 2,3-pentanediol, 2,4-pentanediol, 2-methyl-1,4-butanediol, other chain isomer diols or combinations thereof), hexanediols (e.g., 1,2-hexanediol, 1,3-hexanediol, 1,4-hexanediol, 1,5-hexanediol, 1,6-hexanediol, 2,3-hexanediol, 2,4-hexanediol, 2,5-hexanediol, 3,4-hexanediol, 2-methyl-1,5-pentanediol , 3-methyl-1,5-pentanediol, other linear isomer diols or combinations thereof), heptanediol (e.g., 1,2-heptanediol, 1,3-heptanediol, 1,4-heptanediol, 1,5-heptanediol, 1,6-heptanediol, 1,7-heptanediol, 2,3-heptanediol, 2,4-heptanediol, 2,5-heptanediol, 2,6-heptanediol, 3,4-heptanediol, 3,5-heptanediol, 2-methyl-1,6-hexanediol, 3-methyl-1,6-hexanediol, other linear isomer diols or combinations thereof), octanediol (e.g., 1,2-octanediol, 1,3-octanediol, 1,4-octanediol, 1,5-octanediol, 1,6- octanediol, 1,7-octanediol, 1,8-octanediol, 2-methyl-11,7-heptanediol, 3-methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, other linear isomer diols or combinations thereof), nonanediols (e.g., 1,2-nonanediol, 1,3-nonanediol, 1,4-nonanediol, 1,5-nonanediol, 1,6-nonanediol, 1,7-nonanediol, 1,8-nonanediol, 1,9-nonanediol, 2-methyl-1,8-octanediol, 3-methyl-1,8-octanediol, 4-methyl-1,8-octanediol, other linear isomer diols or combinations thereof), decanediol (e.g., 1,2-decanediol, 1 , 3-decanediol, 1,4-decanediol, 1,5-decanediol, 1,6-decanediol, 1,7-decanediol, 1,8-decanediol, 1,9-decanediol, 1,10-decanediol, 2-methyl-1,9-nonanediol, 3-methyl-1,9-nonanediol, 4-methyl-1,9-nonanediol, 5-methyl-1,9-nonanediol, other linear isomer diols or combinations thereof), cyclohexanediol (e.g., 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol or combinations thereof), cyclohexanedimethanol (e.g., 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol). The bifunctional aliphatic polyurethane di(meth)acrylate may be a commercially available product, for example, any one or more of the products CN2921, CN8003, CN8894, CN8895, and CN9007 from Sartomer.

[0045] In one embodiment, when component A is present, the coating composition may include component A in the following amounts: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75 0, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 1 247, 248, 249, 250 parts by mass, or a range defined by any two of them. In other words, the di(meth)acrylate component may be component A in whole or in part.

[0046] In a preferred embodiment, component A has a viscosity of 1000-10000 cp at 60°C, for example, it may have the following viscosities: 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 260 0, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900, 5000, 5100, 520 0, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000, 6100, 6200, 6300, 6400, 6500, 6600, 6700, 6800, 6900, 7000, 7100, 7200, 7300, 7400, 7500, 7600, 7700, 780 0, 7900, 8000, 8100, 8200, 8300, 8400, 8500, 8600, 8700, 8800, 8900, 9000, 9100, 9200, 9300, 9400, 9500, 9600, 9700, 9800, 9900, 10000 cp, or a range defined by any two of them. As previously mentioned, the viscosity can be measured using a Brookfield viscometer CP51 rotor at 5 rpm.

[0047] In one embodiment, the di(meth)acrylate component may include or be a difunctional aliphatic polyester di(meth)acrylate (i.e., a di(meth)acrylate of an aliphatic polyester diol, hereinafter referred to as component B). The difunctional aliphatic polyester di(meth)acrylate (i.e., component B) may be, for example, a difunctional chain aliphatic polyester diacrylate (i.e., a diacrylate of a chain aliphatic polyester diol), a difunctional cycloaliphatic polyester diacrylate (i.e., a diacrylate of a cycloaliphatic polyester diol), a difunctional chain aliphatic polyester dimethacrylate (i.e., a dimethacrylate of a chain aliphatic polyester diol), a difunctional cycloaliphatic polyester dimethacrylate (i.e., a dimethacrylate of a cycloaliphatic polyester diol), or a mixture thereof. The aliphatic polyester diol may be, for example, a polyester diol obtained by reacting an aliphatic dicarboxylic acid or an anhydride thereof with an excess of an aliphatic diol. Those skilled in the art will understand that the linear aliphatic polyester diol refers to a polyester diol obtained by reacting a linear aliphatic dicarboxylic acid or its anhydride with an excess of a linear aliphatic diol; and the cycloaliphatic polyester diol refers to a polyester diol obtained by polymerizing a part or all of the linear aliphatic dicarboxylic acid or its anhydride replaced by a cycloaliphatic dicarboxylic acid or its anhydride and / or a part or all of the linear aliphatic diol replaced by a cycloaliphatic diol. The aliphatic dicarboxylic acid may, for example, include or be one or more selected from C2-C20 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, or a range defined by any two of them), for example, C4-C10 aliphatic dicarboxylic acid, for example, include or be one or more selected from the following: oxalic acid, malonic acid (1,3-malonic acid), succinic acid (e.g., 1,4-succinic acid, 2-methyl-1,3-malonic acid or a mixture thereof), glutaric acid (e.g., 1,5-glutaric acid, 2-methyl-1,4-succinic acid, other chain isomer diacids or a mixture thereof), adipic acid (e.g., 1,6-hexanedioic acid, 2-methyl-1,5-glutaric acid, 3-methyl-1,5-glutaric acid, other chain isomer diacids or a mixture thereof mixture), pimelic acid (e.g. 1,7-pimelic acid, 2-methyl-1,6-hexanedioic acid, 3-methyl-1,6-hexanedioic acid, other chain isomer diacids or mixtures thereof), suberic acid (e.g. 1,8-suberic acid, 2-methyl-1,7-pimelic acid, 3-methyl-1,7-pimelic acid, 4-methyl-1,7-pimelic acid, other chain isomer diacids or mixtures thereof), azelaic acid (e.g. 1,9-zelaic acid, 2-methyl-1,6-hexanedioic acid, 3-methyl-1,6-hexanedioic acid, other chain isomer diacids or mixtures thereof), methyl-1,8-octanedioic acid, 3-methyl-1,8-octanedioic acid, 4-methyl-1,8-octanedioic acid, other chain isomer diacids or mixtures thereof), sebacic acid (e.g. 1,10-sebacic acid, 2-methyl-1,9-nonanedioic acid, 3-methyl-1,9-nonanedioic acid, 4-methyl-1,9-nonanedioic acid, 5-methyl-1,9-nonanedioic acid, other chain isomer diacids or mixtures thereof), hexahydrophthalic acid (i.e. 1,2-cyclohexanedicarboxylic acid), hexahydroisophthalic acid (i.e. 1,3-cyclohexanedicarboxylic acid), hexahydroterephthalic acid (i.e. 1,4-cyclohexanedicarboxylic acid), or one or more of tetrahydrophthalic acid. The aliphatic diol may, for example, include or be selected from C2-C20 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, or a range defined by any two of them) diols, such as one or more of C2-C10 diols, for example, include or be selected from the following: ethylene glycol, propylene glycol (e.g., 1,2-propylene glycol, 1,3-propylene glycol, or a combination thereof), butanediol (e.g., 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 2-methyl-1,3-propanediol, other The present invention also comprises the following: linear isomer diols or combinations thereof), pentanediols (e.g., 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 2,3-pentanediol, 2,4-pentanediol, 2-methyl-1,4-butanediol, other linear isomer diols or combinations thereof), hexanediols (e.g., 1,2-hexanediol, 1,3-hexanediol, 1,4-hexanediol, 1,5-hexanediol, 1,6-hexanediol, 2,3-hexanediol, 2,4-hexanediol, 2,5-hexanediol, 3,4-hexanediol, 2-methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, other linear isomer diols or combinations thereof), heptanediols (e.g., 1,2-heptanediol, 1,3- heptanediol, 1,4-heptanediol, 1,5-heptanediol, 1,6-heptanediol, 1,7-heptanediol, 2,3-heptanediol, 2,4-heptanediol, 2,5-heptanediol, 2,6-heptanediol, 3,4-heptanediol, 3,5-heptanediol, 2-methyl-1,6-hexanediol, 3-methyl-1,6-hexanediol, other chain isomers or combinations thereof), octanediol (e.g., 1,2-octanediol, 1,3-octanediol, 1,4-octanediol, 1,5-octanediol, 1,6-octanediol, 1,7-octanediol, 1,8-octanediol, 2-methyl-1,7-heptanediol, 3-methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, other chain isomers 1,8-octanediol, 4-methyl-1,8-octanediol, other linear isomer diols or combinations thereof), decanediol (e.g. 1,2-decanediol, 1,3-decanediol, 1,4-decanediol, 1,5-decanediol, 1,6-decanediol, 1,7-decanediol, 1,8-decanediol, 1,9-decanediol, 2-methyl-1,8-octanediol, 3-methyl-1,8-octanediol, 4-methyl-1,8-octanediol, other linear isomer diols or combinations thereof),9-nonanediol, 4-methyl-1,9-nonanediol, 5-methyl-1,9-nonanediol, other chain isomer diols or combinations thereof), cyclohexanediol (e.g., 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol or combinations thereof), cyclohexanedimethanol (e.g., 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol). The bifunctional aliphatic polyester di(meth)acrylate may be a commercially available product, such as any one or more of CN2270, CN2273, CN2281, CN2283, CN2271E, and CN9905 from Sartomer. ,

[0048] In one embodiment, when component B is present, the coating composition may include the following amounts of component B: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75 0, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 1 247, 248, 249, 250 parts by mass, or a range defined by any two of them. In other words, the di(meth)acrylate component may be component B in whole or in part.

[0049] In a preferred embodiment, component B has a viscosity of 10-5000 cp at 25°C, for example, it may have the following viscosities: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700. , 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900, 5000 cp, or a range defined by any two of them. As previously mentioned, the viscosity can be measured using a Brookfield viscometer CP51 rotor at 5 rpm.

[0050] In one embodiment, the di(meth)acrylate component may include or be a di(meth)acrylate of an alkylene glycol and / or a di(meth)acrylate of an ether glycol derived from an alkylene glycol (e.g., an adduct of an alkylene glycol with an alkylene oxide having a different carbon number from that of the alkylene glycol (e.g., ethylene oxide, propylene oxide, butylene oxide, etc., or a combination thereof), and / or a polyalkylene oxide glycol (also referred to as a polyether glycol) (e.g., a glycol obtained by ring-opening polymerization of an alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc., or a combination thereof)) (hereinafter referred to as component C). The di(meth)acrylate of the alkylene glycol and / or the di(meth)acrylate of the ether glycol derived from the alkylene glycol may be, for example, an alkylene glycol diacrylate, a diacrylate of an adduct of an alkylene glycol and an alkylene oxide having a different carbon number from that of the alkylene glycol (e.g., ethylene oxide, propylene oxide, butylene oxide, etc., or a combination thereof), a polyoxyalkylene glycol diacrylate, an alkylene glycol dimethacrylate, a dimethacrylate of an adduct of an alkylene glycol and an alkylene oxide having a different carbon number from that of the alkylene glycol (e.g., ethylene oxide, propylene oxide, butylene oxide, etc., or a combination thereof), a polyoxyalkylene glycol dimethacrylate, or a mixture thereof.

[0051] The alkylene glycol may, for example, include or be selected from C2-C20 (e.g., C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, or a range defined by any two of them) glycol, for example, one or more of C2-C10 glycol, for example, include or be selected from the following: ethylene glycol, propylene glycol (e.g., 1,2-propylene glycol, 1,3-propylene glycol, or a combination thereof), butanediol (e.g., 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 2-methyl-1,3-propanediol, other linear isomer glycols, or a combination thereof), pentanediol ( For example, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,5-pentanediol, 2,3-pentanediol, 2,4-pentanediol, 2-methyl-1,4-butanediol, other linear isomer diols or combinations thereof), hexanediol (for example, 1,2-hexanediol, 1,3-hexanediol, 1,4-hexanediol, 1,5-hexanediol, 1,6-hexanediol, 2,3-hexanediol, 2,4-hexanediol, 2,5-hexanediol, 3,4-hexanediol, 2-methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, other linear isomer diols or combinations thereof), heptanediol (for example, 1,2-heptanediol, 1,3-heptanediol, 1,4-heptanediol, 1,5-heptanediol, 1,6-heptanediol, 2,3-heptanediol, 2,4-heptanediol, 2,5-heptanediol, 3,4-heptanediol, 2-methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, other linear isomer diols or combinations thereof), 1,7-octanediol, 1,8-octanediol, 2-methyl-1,7-heptanediol, 3-methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, other chain isomer diols or combinations thereof), nonanediols (e.g., 1,2-nonanediol, 1,3-nonanediol, 1,4-nonanediol, 1,5-nonanediol, 1,6-nonanediol, 1,7-octanediol, 1,8-octanediol, 2-methyl-1,7-heptanediol, 3-methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, other chain isomer diols or combinations thereof), nonanediol, 1,7-nonanediol, 1,8-nonanediol, 11,9-nonanediol, 2-methyl-1,8-octanediol, 3-methyl-1,8-octanediol, 4-methyl-11,8-octanediol, other linear isomer diols or combinations thereof), decanediol (e.g., 1,2-decanediol, 1,3-decanediol, 1,4-decanediol, 1,5-decanediol, 1,6-decanediol, 1,7-decanediol, 1,8-decanediol, 1,9-decanediol, 1,10-decanediol, 2-methyl-1,9-nonanediol, 3-methyl-1,9-nonanediol, 4-methyl-11,9-nonanediol, 5-methyl-1,9-nonanediol, other linear isomer diols or combinations thereof), cyclohexanediol (e.g., 1,2-cyclohexanediol, 1,3-cyclohexanediol, 1,4-cyclohexanediol or a combination thereof), cyclohexanedimethanol (e.g. 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol). ,

[0052] In this case, the component C may therefore, for example, comprise one or more di(meth)acrylates selected from the above-mentioned alkylene glycols, for example, one or more selected from the following: ethylene glycol di(meth)acrylates (e.g. ethylene glycol diacrylate, ethylene glycol dimethacrylate, or a mixture thereof), 1,3-propylene glycol di(meth)acrylates (i.e. 1,3-propylene glycol diacrylate, 1,3-propylene glycol dimethacrylate, or a mixture thereof), 1,2-propylene glycol di(meth)acrylates (i.e. 1,2-propylene glycol diacrylate, 1,2 -propylene glycol dimethacrylate, or a mixture thereof), 1,4-butanediol di(meth)acrylate, 1,5-pentanediol di(meth)acrylate (i.e., 1,5-pentanediol diacrylate, 1,5-pentanediol dimethacrylate, or a mixture thereof), neopentyl glycol di(meth)acrylate (i.e., neopentyl glycol diacrylate, neopentyl glycol dimethacrylate, or a mixture thereof), 1,6-hexanediol di(meth)acrylate (i.e., 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, or a mixture thereof).

[0053] For the adduct of alkylene glycol and alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc. or a combination thereof) having a different carbon number from the alkylene glycol, the alkylene glycol is the same as described above, provided that the carbon number is different from that of the alkylene oxide, and no further description is given here. For example, the alkylene glycol may be C4-C20 glycol, such as C6-C10 glycol, and the alkylene oxide may be ethylene oxide and / or propylene oxide. The total number of alkylene oxide molecules added to each alkylene glycol molecule is not particularly limited, and may be, for example, 1-20 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or a range defined by any two of them). When multiple alkylene oxides are used for addition, the number of molecules of each alkylene oxide added per alkylene glycol molecule may be, for example, 1 to 19 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 1 to 8, 19, or a range defined by any two thereof), and the total number of additions of all cycloalkylene oxides is 1 to 20. In this case, the component C may include or be one or more di(meth)acrylates selected from the adduct.

[0054] The polyoxyalkylene glycol may be, for example, a polyether glycol obtained by ring-opening polymerization of an alkylene oxide (e.g., ethylene oxide, propylene oxide, butylene oxide, etc. or a combination thereof), such as diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400, polyethylene glycol 600, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, polypropylene glycol 200, polypropylene glycol 300, polypropylene glycol 400, polypropylene glycol 600. In this case, the component C may include or be one or more di(meth)acrylates selected from the above polyoxyalkylene glycols. For example, the component C may include or be one or more selected from the following: any one or more of diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol 200 di(meth)acrylate, dipropylene glycol di(meth)acrylate, tripropylene glycol di(meth)acrylate, and polypropylene glycol 200 di(meth)acrylate.

[0055] In one embodiment, when component C is present, the coating composition may include component C in the following amounts: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 1 37, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 1 247, 248, 249, 250 parts by mass, or a range defined by any two of them. In other words, the di(meth)acrylate component may be component C in whole or in part.

[0056] In a preferred embodiment, component C has a viscosity of 1-100 cp at 25° C., for example, it can have the following viscosity: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40 / 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 cp, or a range defined by any two thereof. As previously mentioned, the viscosity can be measured using a Brookfield viscometer CP40 rotor at 5 rpm.

[0057] The di(meth)acrylate component may consist of component A alone, component B alone, component C alone, component A+B, component A+C, component B+C, or component A+B+C.

[0058] In a preferred embodiment, the di(meth)acrylate component includes or is components A, B and C.

[0059] In an embodiment, when the di(meth)acrylate component includes or is components A, B and C, the amounts of components A, B and C are as described above, provided that the total amount does not exceed the upper limit of 250 parts by mass described for the di(meth)acrylate component.

[0060] In one embodiment, when the di(meth)acrylate component includes or is components A, B and C, component B may be present in the coating composition in an amount of 33-63 parts by mass, such as 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 parts by mass, or a range defined by any two of them, relative to 100 parts by mass of component A.

[0061] In one embodiment, when the di(meth)acrylate component includes or is components A, B and C, relative to 100 parts by mass of component A, component C may be present in the coating composition in the following amount: 50-85 parts by mass, for example, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83 parts by mass, or a range defined by any two of them.

[0062] The di(meth)acrylate component is liquid at room temperature and its constituent components A, B and / or C may all be liquid at room temperature, or a part thereof may be solid at room temperature.

[0063] In a preferred embodiment, the di(meth)acrylate component includes or is:

[0064] A: 100 parts by mass of a difunctional aliphatic polyurethane di(meth)acrylate, which preferably has a viscosity of 1000-10000 cp at 60° C.;

[0065] B: 33-66 parts by mass of a difunctional aliphatic polyester di(meth)acrylate, which preferably has a viscosity of 10-5000 cp at 25° C.;

[0066] C: 50 to 83 parts by mass of an alkylene glycol di(meth)acrylate and / or a polyoxyalkylene glycol di(meth)acrylate having a viscosity of 1 to 100 cp at 25°C.

[0067] When a mixture of the above components AC is used as the di(meth)acrylate component, the resulting composition can be more easily and evenly mixed with the photoconverter by matching components AC with molecular segments of different types and lengths; and at the same time, the crosslinking density and the crosslinking point distribution can be adjusted, so that the prepared optical conversion layer has more excellent properties (such as adhesion of the coating to the substrate, hardness, strength, toughness of the coating, wear resistance and durability of the coating, anti-aging property, etc.).

[0068] In an embodiment, the coating composition includes 66-100 parts of a mono(meth)acrylate component (hereinafter referred to as component D) that is liquid at room temperature. The mono(meth)acrylate component (i.e., component D) may be a monofunctional acrylate, a monofunctional methacrylate, or a mixture thereof. The mono(meth)acrylate component is one or more (meth)acrylates of aliphatic monohydroxy compounds (i.e., an acrylate of an aliphatic monohydroxy compound, a methacrylate of an aliphatic monohydroxy compound, or a mixture thereof), or a plurality (two or more) of (meth)acrylates of aliphatic monohydroxy compounds (i.e., a plurality (two or more) of (meth)acrylates of aliphatic monohydroxy compounds, a plurality (two or more) of methacrylates of aliphatic monohydroxy compounds, or a mixture thereof).

[0069] The monofunctional (meth)acrylate may, for example, include or be one or more selected from (meth)acrylic acid C1-C20 alkyl or C2-C20 oxygen-containing alkyl esters. In the present application, the term "alkyl" includes chain alkyl and cycloalkyl; the term "oxy" alkyl means a group formed by inserting an oxygen atom between carbon-carbon bonds of an alkyl group.

[0070] For example, the monofunctional (meth)acrylate may include or be one or more selected from the following: tetrahydrofurfuryl acrylate (also known as tetrahydrofurfuryl acrylate), tetrahydrofurfuryl methacrylate (also known as tetrahydrofurfuryl methacrylate), isobornyl acrylate, isobornyl methacrylate, C1-C20 alkyl (meth)acrylate (e.g., methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate (e.g., n-, isopropyl or a mixture thereof), butyl (meth)acrylate (e.g., n-, iso-, secondary-, tert-butyl or a mixture thereof), amyl (meth)acrylate (e.g., n-, iso-, secondary-, tert-amyl or a mixture thereof), (meth)acrylate Hexyl (e.g., n-, iso-, neo-, sec-, tert-hexyl, other isomeric hexyl esters, or mixtures thereof), heptyl (meth)acrylate (e.g., n-, iso-, neo-, sec-, tert-heptyl, other isomeric heptyl esters, or mixtures thereof), octyl (meth)acrylate (e.g., n-, iso-, neo-, sec-, tert-octyl, other isomeric octyl esters, or mixtures thereof), nonyl (meth)acrylate (e.g., n-, iso-, neo-, sec-, tert-nonyl, other isomeric nonyl esters, or mixtures thereof), decyl (meth)acrylate (e.g., n-, iso-, neo-, sec-, tert-decyl, other isomeric decyl esters, or mixtures thereof), undecyl (meth)acrylate (e.g., n-, iso-, neo-, sec-, tert-undecyl, other isomeric undecyl, isomeric undecyl esters, or mixtures thereof), dodecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary-, tert-dodecyl esters, other isomeric dodecyl esters, or mixtures thereof), tridecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary-, tert-tridecyl esters, other isomeric tridecyl esters, or mixtures thereof), tetradecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary-, tert-tetradecyl esters, other isomeric tetradecyl esters, or mixtures thereof), pentadecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary-, tert-pentadecyl esters, other isomeric pentadecyl esters, or mixtures thereof), hexadecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary-, tert-pentadecyl esters, other isomeric pentadecyl esters, or mixtures thereof), , neo, secondary, tert-hexadecyl esters, other isomeric hexadecyl esters, or mixtures thereof), heptadecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary, tert-heptadecyl esters, other isomeric heptadecyl esters, or mixtures thereof), octadecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary, tert-octadecyl esters, other isomeric octadecyl esters, or mixtures thereof), nonadecyl (meth)acrylate (e.g., n-, iso-, neo-, secondary, tert-nonadecyl esters, other isomeric dodecyl esters, or mixtures thereof), eicosyl (meth)acrylate (e.g., n-, iso-, neo-, secondary, tert-eicosyl esters, other isomeric eicosyl esters, or mixtures thereof), or mixtures thereof.

[0071] In a preferred embodiment, component D has a viscosity of 1-100 cp at 25° C., for example, it can have a viscosity of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40 / 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 cp, or a range defined by any two of them. As previously mentioned, the viscosity can be measured using a Brookfield viscometer CP40 rotor at 5 rpm.

[0072] In an embodiment, the coating composition may include the following amount, for example, the following amount of component D relative to 100 parts by mass of component A: 66-100 parts by mass, for example 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 parts by mass, or a range limited by any two of them.

[0073] The applicant has found that when the amount of component D in the composition, for example, the amount of component D relative to 100 parts by mass of component A, is within the above range of 66-100 parts by mass, on the one hand, the solubility of the photoconverter can be further increased relative to a lower amount of component D, so that it is completely dissolved and thus more evenly dispersed, thereby facilitating the acquisition of a photoconversion layer that can more effectively convert UV light into visible light and thus has a higher photoconversion efficiency; on the other hand, the yellowing index of the prepared photoconversion coating can be reduced relative to a higher amount of component D, thereby improving its aging resistance.

[0074] In an embodiment, component E is a free radical initiator. The free radical initiator may be appropriately selected depending on the intended application and may be, for example, a photoinitiator, a thermal initiator, or a combination thereof. The photoinitiator may, for example, include or be one or more selected from the following: 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, benzophenone, (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, 2,4,6-trimethylbenzoyl-di(p-tolyl)phosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 2-hydroxy-2-methyl-1-phenylpropanone (2-hydroxy-1-(4-(2-hydroxy-2-methylpropionylphenyl)benzyl)-2-methyl-1-propanone, titanocene photoinitiator, thioacridinone / iodonium salt system, organic peroxide system, borate / dye system, hexaarylbiimidazole / dye system, coumarin ketone / dye system, benzyl condensate Ketone photoinitiators, acetophenone photoinitiators, anthraquinone photoinitiators and derivatives thereof, benzoate photoinitiators, bicyclic diketone compounds, camphorquinone, or any one or a mixture of at least two thereof. The thermal initiator may, for example, include or be selected from one or more of the following: tert-butyl peroxide-2-ethylhexanoate, 3-2-tert-butyl peroxide, tert-diisopropylbenzene peroxide, 2,5-dihydroperoxide, tert-butyl peroxide-2-ethylhexanoate, tert-butyl peroxide-3,3,5-trimethylcyclohexanoate, tert-butyl peroxide-laurate, tert-butyl peroxide-2-ethylhexyl carbonate, 4-methylbenzoyl peroxide, tert-butyl peroxide-2-ethylhexanoate, tert-amyl peroxide-2-ethylhexyl carbonate, and tert-butyl peroxide-3,5,5-trimethylhexanoate.

[0075] Component E is present in the coating composition in an amount effective to initiate free radical polymerization of the two-component (meth)acrylate and the one-component (meth)acrylate. In an embodiment, the coating composition may include the following amount, for example, the following amount of component E relative to 100 parts by mass of component A: 6-16 parts by mass, for example, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 parts by mass, or a range defined by any two of them.

[0076] In an embodiment, component F is a UV light conversion agent. In the present application, a UV light conversion agent is also referred to as a light conversion agent or a light conversion agent. The UV light conversion agent is not particularly limited and may be various UV light conversion agents commonly used in the art. Preferably, the UV light conversion agent is a UV light conversion agent that does not adversely affect polymerization during the free radical polymerization of the composition. The UV light conversion agent may, for example, include one or more selected from an organic fluorescent material, a rare earth luminescent material, and a quantum dot luminescent material. The organic fluorescent material may include benzotriazole fluorescent materials (such as the light converter F1 shown below), rhodamine fluorescent materials (such as rhodamine B (light converter F2) with the structure shown below), carbon ring materials (such as fluorescent brightener ER, fluorescent brightener CBS-X, etc.), triazine amino diphenylethylene materials (such as fluorescent brightener DMS), organic triazoles, diphenylethylene-triazole materials (such as Tinopal PBS, Blankophor BHC, etc.), benzoxazole materials (such as fluorescent brightener OB-1, fluorescent brightener 393, etc.), furan, benzofuran, benzimidazoles, benzotriazoles and benzothiadiazole skeletons.

[0077]

[0078] In an embodiment, the coating composition may include component F in an amount of 3-5 parts by mass, such as 3.0, 3.5, 4.0, 4.5, 5.0 parts by mass, or a range defined by any two of the above, relative to 100 parts by mass of component A.

[0079] The coating composition of the present invention is suitable for coating by, for example, conventional coating equipment. For example, when it comprises components A, B and C, especially 100 parts by mass of component A having a viscosity of 1000-10000 cp at 60° C., 33-66 parts by mass of component B having a viscosity of 10-5000 cp at 25° C., and 50-83 parts by mass of component C having a viscosity of 1-100 cp at 25° C., it may have, for example, the following viscosity at 25° C.: 1-100 cp, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100 cp, or a range defined by any two of them. The viscosity of the components A and B can be measured using a Brookfield viscometer CP51 rotor, and the viscosity of the component C can be measured using a Brookfield viscometer CP40 at 5 rpm.

[0080] In an embodiment, the coating composition may optionally include an inert diluent, depending on the desired viscosity. The diluent is not particularly limited and may, for example, include or be one or more of ethanol, ethyl acetate, butyl acetate, dimethyl carbonate, isohexanediol, propylene carbonate, etc.

[0081] The amount of the diluent is not particularly limited. For example, the coating composition may include the following amounts, for example, the following amounts of diluent relative to 100 parts by mass of component A: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200 parts by mass, or a range defined by any two of them.

[0082] The coating composition may not contain a non-reactive (non-radical polymerizable) polymer matrix commonly used in the art; the coating composition forms a cross-linked polymer by free radical polymerization of the di(meth)acrylate component and the mono(meth)acrylate component, such as the components AD described above. However, the coating composition may also contain a non-reactive (non-radical polymerizable) polymer matrix commonly used in the art, which will not deviate from the spirit and scope of the present invention. For example, the coating composition may contain one or more non-reactive (non-radical polymerizable) polymer matrices selected from the following: polyethylene terephthalate, polymethyl methacrylate, polyvinyl butyral, ethylene vinyl acetate copolymer, ethylene tetrafluoroethylene copolymer, polyimide, amorphous polycarbonate, polystyrene, polyurethane, polyacrylate, and combinations thereof. The amount of the polymer matrix is ​​not particularly limited and can be an appropriate amount that can be dissolved in the coating composition of the present invention, for example, it can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 parts by mass, or a range limited by any two thereof.

[0083] The coating composition may also optionally include one or more other auxiliary agents (or additives) commonly used in the light conversion layer in the art. The auxiliary agent may include, for example, one or more of the following: light stabilizer, antioxidant, etc. The light stabilizer is any one of a light shielding agent light stabilizer, a quencher light stabilizer, a free radical scavenger light stabilizer, and a hydroperoxide decomposer light stabilizer, or a mixture of at least two thereof; the antioxidant is any one of a hindered phenol antioxidant, an aromatic amine antioxidant, a phosphite antioxidant, a thioether antioxidant, and a metal passivator antioxidant, or a mixture of at least two thereof.

[0084] The amount of the auxiliary agent used may be a commonly used amount in the art. For example, in the coating composition, the amount of each auxiliary agent may be 0.1-5 parts by mass.

[0085] UV light conversion coating

[0086] In a second aspect, the present invention relates to a UV light converting coating obtained by free radical polymerization of a coating composition according to the first aspect of the invention.

[0087] The thickness of the light conversion coating is not particularly limited, and can be a thickness commonly used for light conversion coatings in the art taking into account factors such as light conversion efficiency and durability of the light conversion coating. For example, the thickness of the light conversion coating can be 0.5 μm-1 mm, such as 0.5, 1, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900, 1000 μm, or a range defined by any two thereof.

[0088] By using the coating composition according to the first aspect of the present invention, the thickness, shape and size of the required UV light conversion coating can be flexibly controlled as needed; and in terms of converting UV light into visible light (i.e., reducing the transmittance of UV band light and increasing the transmittance of visible light wavelengths) and conversion efficiency, the UV light conversion coating of the present invention can still have an effect comparable to or even better than that of commercially available thicker (e.g., 100 μm) commercial light conversion films even at a very thin thickness, such as less than 100 μm, such as less than 80 μm, or even less than 50 μm.

[0089] Preparation method of UV light conversion coating

[0090] In a third aspect, the present invention relates to a method for preparing a UV light conversion coating according to the second aspect of the present invention, which comprises coating a coating composition according to the first aspect of the present invention on a substrate surface, and subjecting the coated coating composition to free radical polymerization.

[0091] The substrate may be, for example, a photovoltaic cell or a photovoltaic module.

[0092] The coating can be carried out by any suitable means known in the art. For example, the coating can be carried out by spraying, brushing, knife coating, casting, roller coating, etc.

[0093] The free radical polymerization can be carried out by methods known in the art, depending on the type and amount of free radical initiators included in the coating composition. For example, when a thermal initiator is included, the coating composition can be polymerized at a temperature that allows the thermal initiator to decompose and form free radicals; when a photoinitiator is included, the coating composition can be polymerized by exposing it to radiation, such as UV light. When both a thermal initiator and a photoinitiator are included, thermally initiated polymerization can be performed first, followed by photoinitiated polymerization, or photoinitiated polymerization can be performed first, followed by thermally initiated polymerization, or both thermally initiated and photoinitiated polymerization can be performed simultaneously. The conditions and details of the free radical polymerization are well known in the art and are not described in detail herein.

[0094] In addition, when the coating composition includes an inert diluent, the inert diluent may be removed after coating, before, during and / or after polymerization. The removal may be performed by conventional means in the art, such as air-drying or drying.

[0095] Photovoltaic cells

[0096] In a fourth aspect, the present invention relates to a photovoltaic cell comprising a UV light conversion coating according to the second aspect of the present invention formed on a surface of the photovoltaic cell.

[0097] The structure of a photovoltaic cell is well known in the art and will not be described in detail here.

[0098] The UV light conversion coating can be formed on a photovoltaic cell by directly coating the coating composition according to the first aspect of the present invention on the surface of the photovoltaic cell, followed by free radical polymerization.

[0099] Alternatively, the UV light conversion coating can also be formed on the photovoltaic cell by directly coating the coating composition according to the first aspect of the present invention on other substrate surfaces, followed by free radical polymerization; then the resulting film is peeled off from the carrier and then disposed on the photovoltaic cell surface.

[0100] The arrangement can be performed by directly laminating the film on the photovoltaic cell surface. Alternatively, the arrangement can also be performed by treating the photovoltaic cell surface (eg, corona treatment, application of adhesive, etc.) and then laminating the film on the treated photovoltaic cell surface.

[0101] After being applied on the surface of the photovoltaic cell, no other functional layer may be further applied on the exposed surface of the photoconversion coating. Alternatively, a protective layer, for example, for further inhibiting the penetration of oxygen and moisture into the photoconversion coating, may also be further applied on the exposed surface of the photoconversion coating. The protective layer may include a polymer matrix. In some embodiments, the polymer matrix of the protective layer may include a substance selected from the following: polyethylene terephthalate, polymethyl methacrylate, polyvinyl butyral, ethylene vinyl acetate copolymer, ethylene tetrafluoroethylene copolymer, polyimide, amorphous polycarbonate, polystyrene, siloxane sol-gel, polyurethane, polyacrylate and combinations thereof. The thickness of the protective layer is not particularly limited, and may, for example, range from about 10 μm to about 2 mm, for example, from about 20 μm to about 1 mm.

[0102] By using the UV light conversion coating of the second aspect of the present invention, the resulting photovoltaic cell can more effectively convert UV light into visible light (i.e., reduce the transmittance of UV band light and increase the transmittance of visible light wavelengths) compared to using conventional light conversion films, thereby improving the light conversion efficiency.

[0103] Photovoltaic cell modules

[0104] In a fifth aspect, the present invention relates to a photovoltaic cell module comprising a UV light conversion coating according to the second aspect of the present invention formed on the inner and / or outer surface of the front glass and / or back glass of the photovoltaic cell module.

[0105] Photovoltaic cell assembly, also known as solar cell panel, is a power generation device composed of multiple solar cells connected in series or in parallel and packaged. It usually includes components such as battery cells, packaging materials, backplane, connectors and cables. The structure and composition of photovoltaic cell assembly are well known in the art and will not be described here.

[0106] The above description of the photovoltaic cell according to the fourth aspect of the present invention is also applicable to the photovoltaic cell assembly.

[0107] Example

[0108] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0109] The information of raw materials used in the examples is as follows.

[0110] A1: Aliphatic polyurethane diacrylate CN2921 from Sartomer, viscosity measured by Brookfield viscometer CP51 rotor at 5rpm is 2000-4000cP@60℃

[0111] A2: Aliphatic polyurethane diacrylate CN8891 from Sartomer, viscosity measured by Brookfield viscometer CP51 rotor at 5rpm is 6000-7000cP@60℃

[0112] B1: Polyester diacrylate CN2270 from Sartomer, viscosity 20-50 cP @ 25°C measured with Brookfield viscometer CP40 spindle at 5 rpm

[0113] B2: Polyester diacrylate CN2273 from Sartomer, viscosity 120-220 cP @ 25°C measured with Brookfield viscometer CP40 spindle at 5 rpm

[0114] C1: Neopentyl glycol diacrylate

[0115] C2: 1,6-Hexanediol diacrylate

[0116] D1: Tetrahydrofuran acrylate

[0117] D2: Isobornyl acrylate

[0118] E: Free radical initiator (2,4,6-trimethylbenzoyl) di(p-tolyl)phosphine oxide (TMO) from Shanghai Feikai

[0119] F1: The light conversion agent from Ruiers Technology Co., Ltd. is an anti-aging modified benzotriazole fluorescent material with the structure shown above.

[0120] F2: A photoconverter purchased from MacLean Reagent Company, which is a rhodamine fluorescent agent Rhodamine B with the structure shown above

[0121] Test Method

[0122] 1. Light transmittance: According to the standard GB / T 29848-2018, the test was carried out using a UV-visible spectrophotometer (PerkinElmer LAMBDA 950).

[0123] 2. Photoelectric conversion efficiency: The absolute quantum efficiency test was performed using a Horiba spectrometer FL-3 and an integrating sphere at room temperature. Photoelectric conversion efficiency = number of blue light photons emitted / number of ultraviolet light photons absorbed (350nm wavelength excitation).

[0124] 3. Solubility of photoconverter: Using the photoconverter as the solute and a mixed liquid prepared by mixing the above components A1 or A2, B1 or B2, C1 or C2, D1 or D2, and E in proportion as the solvent, observe the dissolution of 5 g of the photoconverter F1 or F2 in 100 g of the above mixed liquid.

[0125] 4. Adhesion: Adhesion test is carried out according to the method and conditions specified in ISO2409; the coating is scraped onto white glass with a size of 5cm*10cm to a thickness of 100μm The coating is then scratched with a standard cutter into 10*10 square grids (each grid has a side length of 1mm). After the test, if there is no coating shedding in all 100 grids, it is 5B; if the coating shedding area of ​​100 grids is no more than 5%, it is 4B; if the coating shedding area of ​​100 grids is greater than 5% but not greater than 15%, it is 3B.

[0126] 5. Volume resistivity: The volume surface resistivity tester model BEST-380 produced by Beijing Beiguang Precision Instrument Co., Ltd. is used for testing in accordance with the method specified in GB / T1410.

[0127] 6. Aging yellowing test: After UV curing, the photoconversion coating film with a thickness of about 100μm was placed in a 200℃ oven. After 3 hours, the film was taken out and the b* value after aging was measured using a spectrophotometer (manufacturer: Hangzhou Caipu Technology Co., Ltd., model CS-821N). This value reflects the photoconversion coating's resistance to aging and yellowing.

[0128] The above tests were all carried out at 25°C and 50% RH.

[0129] Examples 1-12 and Comparative Examples 1-8

[0130] According to the composition shown in Table 1, a monofunctional acrylate monomer (D1 or D2), a light conversion agent (F1 or F2) and a free radical initiator (E1) were placed in a stirring kettle and stirred until completely dissolved; then aliphatic polyurethane diacrylate (A1 or A2), polyester diacrylate (B1 or B2), and difunctional alkylene glycol diacrylate (component C1 or C2) were added and stirred and mixed until uniform, thereby preparing the coating compositions of Examples 1-12 and Comparative Examples 1-8, respectively.

[0131] The coating compositions of Examples 1-12 and Comparative Examples 1-8 were respectively scraped onto white glass using a scraper, and then a 365 nm UV LED, 3000 mJ / cm 2 Unless otherwise specified, the thickness of the UV light conversion coating prepared in each example and comparative example is about 100 μm.

[0132] Each embodiment and comparative example was tested by the method described in the test method section, and the test results are shown in Tables 2 and 3. The comparative film shown in Table 2 is a commercially available light conversion film (brand: Saiwu, model: WT11).

[0133] It can be seen from Table 2-3 that, compared with the commercially available light conversion film, the UV light conversion coatings of the same thickness prepared in Examples 1-8 of the present invention significantly reduce the transmittance in the UV band (280-380nm), and increase the transmittance in the visible light band (380-1100nm), thereby improving the light conversion efficiency. In addition, even with a lower thickness, the UV light conversion coating of the present invention can achieve a comparable or even lower transmittance in the UV band (280-380nm), a higher transmittance in the visible light band (380-1100nm), and a comparable or even higher light conversion efficiency.

[0134] It can also be seen from Table 3 that, compared with the light conversion coatings of Comparative Examples 1-4 using a lower amount of component D1, the light conversion agent in the light conversion coatings of Examples 1-8 of the present invention using a higher amount of component D1 and other conditions being the same has better solubility, and compared with the light conversion coatings of Comparative Examples 5-8 using a higher amount of component D1, the light conversion coatings of Examples 1-8 of the present invention using a lower amount of component D1 and other conditions being the same have achieved a lower yellowing index, indicating that they have higher anti-aging properties. In addition, compared with the light conversion coatings of Comparative Examples 5 and 7 using a higher amount of component D1 and other conditions being the same, Examples 1, 3 and 5, and compared with the light conversion coatings of Comparative Examples 5 and 7 using a higher amount of component D1 and other conditions being the same, and Examples 2, 4 and 6, compared with the light conversion coatings of Comparative Examples 6 and 8 using a higher amount of component D1 and other conditions being the same, all reduce the transmittance in the UV band (280-380nm), improve the transmittance in the visible light band (380-1100nm), and achieve comparable or even slightly higher light conversion efficiency.

[0135] The above is only an exemplary embodiment of the present invention. It should be noted that, for those skilled in the art, without departing from the inventive concept of the present invention, improvements can be made to the present invention, but these all belong to the protection scope of the present invention.

[0136]

[0137]

Claims

1. A coating composition for forming a UV light conversion coating for a photovoltaic cell, comprising, by mass: 180-250 parts of a di(meth)acrylate component that is liquid at room temperature, which is a di(meth)acrylate of one or more aliphatic dihydroxy compounds; 66-100 parts of a mono(meth)acrylate component that is liquid at room temperature, which is a (meth)acrylate of one or more aliphatic monohydroxy compounds; 6-16 parts of a free radical initiator; 3-5 parts of UV light converter; and 0-200 parts of inert diluent.

2. The coating composition according to claim 1, wherein the aliphatic dihydroxy compound comprises (A) an aliphatic polyurethane diol; (B) an aliphatic polyester diol; (C) an alkylene glycol, an adduct of an alkylene glycol and an alkylene oxide having a different carbon number from that of the alkylene glycol, and / or a polyalkylene oxide diol; or any combination thereof.

3. The coating composition according to claim 2, wherein the aliphatic dihydroxy compound is a mixture of: (A) an aliphatic polyurethane diol; (B) an aliphatic polyester diol; and (C) an alkylene glycol, an adduct of an alkylene glycol and an alkylene oxide having a carbon number different from that of the alkylene glycol, and / or a polyalkylene oxide diol.

4. The coating composition of claim 2, wherein the aliphatic polyurethane diol is a polyurethane diol obtained by reacting an aliphatic diisocyanate with an excess of an aliphatic diol, wherein the aliphatic diisocyanate is one or more selected from C6-C20 diisocyanates, the carbon number of which includes the carbon in the isocyanate group, and the aliphatic diol is one or more selected from C2-C20 diols.

5. The coating composition according to claim 4, wherein the aliphatic diisocyanate is one or more selected from the group consisting of dicyclohexylmethane diisocyanate, cyclohexyl diisocyanate, cyclohexane dimethylene diisocyanate, isophorone diisocyanate, 1,4-diisocyanate butane, 1,12-diisocyanatotridecane or hexamethylene diisocyanate.

6. The coating composition as claimed in claim 4, wherein the aliphatic diol is one or more selected from the following: ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, cyclohexanediol, cyclohexanedimethanol.

7. The coating composition according to claim 2, wherein the aliphatic polyester diol is a polyester diol obtained by reacting an aliphatic dicarboxylic acid or anhydride thereof with an excess of an aliphatic diol, wherein the aliphatic dicarboxylic acid is one or more selected from C2-C20 aliphatic dicarboxylic acids, and the aliphatic diol is one or more selected from C2-C20 diols.

8. The coating composition of claim 7, wherein the aliphatic dicarboxylic acid is one or more selected from the group consisting of oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, hexahydrophthalic acid, hexahydroisophthalic acid, hexahydroterephthalic acid, or tetrahydrophthalic acid.

9. The coating composition according to claim 7, wherein the aliphatic diol is one or more selected from the following: ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, cyclohexanediol, cyclohexanedimethanol.

10. The coating composition according to claim 2, wherein the alkylene glycol is one or more selected from C2-C20 glycols.

11. The coating composition according to claim 2, wherein the alkylene glycol is one or more selected from the following: ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, heptanediol, octanediol, nonanediol, decanediol, cyclohexanediol, cyclohexanedimethanol.

12. The coating composition according to claim 2, wherein the alkylene oxide is one or more selected from ethylene oxide, propylene oxide, and butylene oxide.

13. The coating composition according to claim 2, wherein the total number of alkylene oxide molecules added to each alkylene glycol molecule in the adduct is 1 to 20.

14. The coating composition according to claim 2, wherein the alkylene oxide used in the polyoxyalkylene glycol is one or more selected from ethylene oxide, propylene oxide, and butylene oxide.

15. The coating composition of claim 2, wherein the polyoxyalkylene glycol is one or more selected from the following: diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol 200, polyethylene glycol 300, polyethylene glycol 400, polyethylene glycol 600, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, polypropylene glycol 200, polypropylene glycol 300, polypropylene glycol 400, polypropylene glycol 600.

16. The coating composition of claim 2, wherein the di(meth)acrylate of the aliphatic polyurethane diol has a viscosity of 1000-10000 cp at 60°C.

17. The coating composition of claim 2, wherein the di(meth)acrylate of the aliphatic polyester diol has a viscosity of 10-5000 cp at 25°C.

18. The coating composition according to claim 2, wherein the di(meth)acrylate of an alkylene glycol, the di(meth)acrylate of an adduct of an alkylene glycol and an alkylene oxide having a carbon number different from that of the alkylene glycol, and / or the di(meth)acrylate of a polyoxyalkylene glycol has a viscosity of 1-100 cp at 25°C.

19. The coating composition of claim 1, wherein the mono(meth)acrylate component has a viscosity of 1-100 cp at 25°C.

20. The coating composition of any one of claims 1 to 19, wherein the di(meth)acrylate component is: 100 parts by mass of aliphatic polyurethane diol di(meth)acrylate; 33-63 parts by mass of aliphatic polyester diol di(meth)acrylate; 50-85 parts by mass of alkylene glycol di(meth)acrylate, di(meth)acrylate of an adduct of alkylene glycol and an alkylene oxide having a carbon number different from that of the alkylene glycol, polyoxyalkylene glycol di(meth)acrylate, or a mixture thereof.

21. The coating composition of any one of claims 1 to 19, wherein the di(meth)acrylate component is: 100 parts by mass of aliphatic polyurethane diol diacrylate; 33-63 parts by mass of aliphatic polyester diol diacrylate; 50-85 parts by mass of alkylene glycol diacrylate, diacrylate of an adduct of alkylene glycol and an alkylene oxide having a carbon number different from that of the alkylene glycol, polyoxyalkylene glycol diacrylate, or a mixture thereof.

22. The coating composition according to any one of claims 1 to 19, wherein the mono(meth)acrylate is one or more selected from the group consisting of C1-C20 alkyl(meth)acrylates and C2-C20 oxygen-containing alkyl(meth)acrylates.

23. The coating composition of any one of claims 1 to 19, wherein the mono(meth)acrylate is selected from one or more of the following: tetrahydrofuran (meth)acrylate, isobornyl (meth)acrylate, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate, nonadecyl (meth)acrylate, eicosyl (meth)acrylate, or a mixture thereof.

24. The coating composition according to any one of claims 1 to 19, wherein the mono(meth)acrylate is selected from one or more of the following: tetrahydrofuran acrylate, isobornyl acrylate, octadecyl acrylate.

25. The coating composition of any one of claims 1 to 19, wherein the free radical initiator is a photoinitiator, a thermal initiator, or a combination thereof.

26. The coating composition according to any one of claims 1 to 19, wherein the UV light conversion agent comprises one or more selected from the group consisting of an organic fluorescent material, a rare earth luminescent material, and a quantum dot luminescent material.

27. The coating composition according to any one of claims 1 to 19, wherein the UV light conversion agent comprises one or more selected from the group consisting of a benzotriazole fluorescent material, a rhodamine fluorescent material, and a quantum dot luminescent material.

28. The coating composition according to any one of claims 1 to 19, further comprising 1 to 50 parts by mass of a non-radical polymerizable polymer.

29. A UV light conversion coating obtained by free radical polymerization of the coating composition according to any one of claims 1 to 28.

30. A method for preparing a UV light conversion coating, comprising coating the coating composition according to any one of claims 1 to 28 on a substrate surface, and subjecting the coated coating composition to free radical polymerization.

31. A photovoltaic cell comprising the UV light conversion coating of claim 29 formed on a surface thereof.

32. A photovoltaic cell module comprising the UV light conversion coating according to claim 29 formed on the inner surface and / or outer surface of the front glass and / or the back glass of the photovoltaic cell module.

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