Coating for preparing mask, mask and preparation method of mask

Abstract

The invention relates to the technical field of solar cells, in particular to a coating for preparing a mask, the mask and a preparation method of the mask. The coating is prepared from the following raw materials in parts by weight: 100 parts of a mask precursor, 0.05 to 5 parts of a vulcanizing agent, 0.05 to 8 parts of a cross-linking agent and 10 to 5000 parts of an organic solvent, wherein the mask precursor is selected from one or more of an olefin copolymer, a fluorine-containing organic compound, organic silicon, polyacrylic acid, polyacrylate, polyurethane, a polycarbonate film, epoxy resin and polyimide. The coating for preparing the mask, provided by the invention, can be used for preparing the mask with the advantages of high light transmittance, high volume resistance value, good water resistance and the like through thermal spraying film formation.

Description

Technical Field

[0001] The invention relates to the technical field of solar cells, and in particular to a coating for preparing a mask, a mask and a preparation method thereof. Background Art

[0002] During the production and processing of crystalline silicon solar cells, a mask process is often required. That is, before a certain process is performed, a mask needs to be prepared in the area where the process is not required for protection, and the mask is removed after the process is completed.

[0003] The current masks mainly have problems such as poor light transmittance, small volume resistance, and poor water vapor stability. In addition, a large amount of solvent is required in the process of removing the mask, which has poor environmental performance.

[0004] Therefore, there is an urgent need to provide a mask having the advantages of high light transmittance, high volume resistance, good water resistance, and easy removal, and a preparation method thereof. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art, such as poor light transmittance of the mask, poor water vapor stability, and the need to use a large amount of solvent in the mask removal process, and to provide a coating for preparing a mask, a mask and a preparation method thereof.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a method for preparing a mask coating, wherein the raw materials for preparing the coating include: 100 parts by weight of a mask precursor, 0.05-5 parts by weight of a vulcanizing agent, 0.05-8 parts by weight of a cross-linking agent and 10-5000 parts by weight of an organic solvent; wherein the mask precursor is selected from one or more of olefin copolymers, fluorine-containing organic compounds, silicones, polyacrylic acids, polyacrylates, polyurethanes, polycarbonate films, epoxy resins, and polyimides.

[0007] The second aspect of the present invention provides a method for preparing a mask, wherein the method comprises thermally spraying the coating material described in the first aspect of the present invention into a film.

[0008] The third aspect of the present invention provides a mask prepared by the preparation method described in the second aspect of the present invention.

[0009] Through the above technical solution, the beneficial technical effects achieved by the present invention are as follows:

[0010] 1) The coating for preparing a mask provided in the present invention can be used to prepare a mask having the advantages of high light transmittance, high volume resistance, good water resistance, etc. by thermal spraying.

[0011] 2) The method for preparing the mask provided in the present invention has a simple process and mild operating conditions and is suitable for industrial production. DETAILED DESCRIPTION

[0012] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0013] The first aspect of the present invention provides a method for preparing a coating for a mask, wherein the raw materials for preparing the coating include: 100 parts by weight of a mask precursor, 0.05-5 parts by weight of a vulcanizing agent, 0.05-8 parts by weight of a cross-linking agent and 10-5000 parts by weight of an organic solvent; wherein the mask precursor is selected from one or more of olefin copolymers, fluorine-containing organic compounds, silicones, polyacrylic acids, polyacrylates, polyurethanes, polycarbonates, epoxy resins and polyimides.

[0014] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the weight of the vulcanizing agent can be 0.01, 0.02, 0.05, 0.1, 0.2, 0.3, 0.5, 0.8, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, and any number between these values, preferably 0.05-2 parts by weight, and more preferably 0.1-1 parts by weight.

[0015] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the weight portion of the crosslinking agent can be 0.01, 0.02, 0.05, 0.1, 0.2, 0.3, 0.5, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 7, 8, and any number between these values, preferably 0.05-2 parts by weight, and more preferably 0.1-1 parts by weight.

[0016] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the sum of the weight parts of the vulcanizing agent and the cross-linking agent is 0.1-3 parts by weight, preferably 0.2-1.5 parts by weight.

[0017] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the weight of the organic solvent can be 10, 50, 80, 100, 200, 500, 800, 1000, 2000, 5000, and any number between these values, preferably 50-2000 parts by weight, and more preferably 200-1000 parts by weight.

[0018] In one embodiment of the present invention, the mask precursor is an olefin copolymer; wherein the olefin copolymer is selected from one or more of polyolefin elastomer, poly 1-butene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate copolymer, preferably polyolefin elastomer and / or ethylene-vinyl acetate copolymer.

[0019] In one embodiment of the present invention, the polyolefin elastomer is a polymerization product of ethylene and α-olefin; wherein the α-olefin is selected from C 2 -C 12 Straight-chain or branched α-olefins.

[0020] In one embodiment of the present invention, the content of ethylene structural units in the polyolefin elastomer is ≥10wt%, preferably 50-90wt%, and the melt index (MI, test conditions 190°C / 2.16kg) is not less than 2g / 10min, preferably 5-100g / 10min, and further preferably 10-30g / 10min.

[0021] In one embodiment of the present invention, the polyolefin elastomer is selected from one or more of ethylene-octene copolymer, ethylene-butene copolymer and ethylene-hexene copolymer.

[0022] In one embodiment of the present invention, the content of vinyl acetate structural units in the ethylene-vinyl acetate copolymer is 10-40 wt %, and the melt index (MI, testing conditions 190° C. / 2.16 kg) is 10-10000 g / 10 min.

[0023] Wherein, in the present invention, the mass content of vinyl acetate structural units in the ethylene-vinyl acetate copolymer can be 10%, 15%, 20%, 25%, 30%, 35% and 40%, and any number between these values, preferably 20-40wt%. The melt index (MI, testing conditions 190°C / 2.16kg) of the ethylene-vinyl acetate copolymer can be 10g / 10min, 20g / 10min, 30g / 10min, 40g / 10min, 50g / 10min, 60g / 10min, 70g / 10min, 80g / 10min, 90g / 10min, 100g / 10min, 150g / 10min, 200g / 10min, 250g / 10min, 300g / 10min, 350g / 10min, 400g / 10min, 450g / 10min, 500g / 10min, 550g / 10min, g / 10min, 600g / 10min, 650g / 10min, 700g / 10min, 750g / 10min, 800g / 10min, 850g / 10min, 900g / 10min, 950g / 10min, 1000g / 10min, 2000g / 10min, 3000g / 10min, 4000g / 10min, 5000g / 10min, 6000g / 10min, 7000g / 10min, 8000g / 10min, 9000g / 10min, 10000g / 10min, and any number between these values, preferably 20-500g / 10min.

[0024] In one embodiment of the present invention, the vulcanizing agent is an organic peroxide vulcanizing agent; the organic peroxide vulcanizing agent is selected from di-tert-butyl peroxide (DTBP, CAS#110-05-4), tert-butyl hydroperoxide (TBHP, CAS#75-91-2), tert-butyl peroxybenzoate (TBPB, CAS#614-45-9), dibenzoyl peroxide (BPO, CAS#94-36-0), diisopropyl peroxide (DCP, CAS#80-43-3), di(tert-butylperoxyisopropyl)benzene (BIPB, CAS#2212-81-9), 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (BPDH, CAS#78-6 3-7), tert-butyl peroxy isopropyl formate (CAS#2372-21-6), tert-butyl peroxide isopropyl benzene (CAS#3457-61-2), tert-butyl peroxy-2-ethylhexyl carbonate (TBEC, CAS#34443-12-4), tert-butyl peroxy isopropyl carbonate (TBIC, CAS#2372-21-6), tert-amyl peroxy (2-ethylhexyl) carbonate (TAEC, CAS#70833-40-8), ethyl 3,3-di(tert-butylperoxy)butyrate (CAS#67567-23-1), tert-butyl peroxy-3,5,5-trimethylhexanoate (TBBIN, CAS#13122-18-4), 4,4-di(tert-butylperoxy) 1,4-bis(tert-butylperoxyisopropylbenzene) (CAS#25155-25-33), 1,3-bis(tert-butylperoxyisopropylbenzene) (CAS#2212-81-9), bis(4-methylbenzoyl) peroxide (CAS#895-85-2), 3,5,7,7-pentamethyl-1,2,4-trioxepane (CAS#215877-64-8), dilauroyl peroxide (CAS#105-74-8), tert-amyl peroxide-2-ethylhexanoate (CAS#686-31-7), 2-Ethylperoxyhexanoic acid-1,1,3,3-tetramethylbutyl ester (CAS#22288-43-3), diethylperoxyacetic acid-tert-butyl ester (CAS#2550-33-6), peroxy-2-ethylhexanoic acid-tert-butyl ester (CAS#3006-82-4), peroxyisobutyric acid-tert-butyl ester (CAS#109-13-7), 1,1'-azo(cyanocyclohexane) (CAS#2094-98-6), 1,1-bis(tert-amylperoxy)cyclohexane (CAS#15667-10-4), peroxyacetic acid-tert-amyl ester (CAS#690-83-5), 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane (CAS#6731-36-8), 2,One or more of 2-bis(tert-butylperoxy)butane (CAS#2167-23-9), 1,1-di(tert-butylperoxy)cyclohexane (CAS#3006-86-8), and tert-butylperoxyneodecanoate (CAS#13052-09-0).

[0025] In one embodiment of the present invention, the crosslinking agent is a compound containing multiple unsaturated C=C functional groups. The compound containing multiple unsaturated C=C functional groups is selected from triallyl isocyanurate, triallyl cyanurate, tris(2-hydroxyethyl)isocyanuric acid triacrylate, tris(2-hydroxyethyl)isocyanuric acid trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane trimethacrylate, propoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane trimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, One or more of esters, neopentyl glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, cyclohexanedimethanol-1,4-diacrylate, cyclohexanedimethanol-1,4-dimethacrylate, poly(ethylene glycol) diacrylate, poly(ethylene glycol) dimethacrylate, poly(propylene glycol) diacrylate, poly(propylene glycol) dimethacrylate, ditrimethylolpropane tetraacrylate, ditrimethylolpropane tetramethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, tetramethyltetravinylcyclotetrasiloxane, trimethyltrivinylcyclotrisiloxane, vinyl-terminated polydimethylsiloxane, propoxylated allyl methacrylate, divinylbenzene, and diallyl phthalate.

[0026] In one embodiment of the present invention, the organic solvent is selected from alkanes, aromatic hydrocarbons, ketones, esters, halogenated hydrocarbons and thio compound solvents, preferably selected from one or more of dichloromethane, chloroform, dichloroethane, chloroform, toluene, xylene, cyclohexane, carbon tetrachloride, carbon disulfide, acetone, butanone, pentanone, ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, ethylene glycol methyl ether acetate, diphenyl ether and tetrahydrofuran. In the present invention, for different mask precursors, the organic solvent can be selected according to common knowledge, and the present invention will not repeat them one by one.

[0027] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the raw materials for preparing the coating further include 0.05-2 parts by weight of a coupling agent and 0.005-2 parts by weight of an ultraviolet light stabilizer.

[0028] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the weight of the coupling agent can be 0.01, 0.02, 0.05, 0.1, 0.2, 0.3, 0.5, 0.8, 1, 1.5, 2, and any number between these values, preferably 0.08-1.6 parts by weight, and more preferably 0.1-1 parts by weight.

[0029] In one embodiment of the present invention, based on 100 parts by weight of the mask precursor, the weight portion of the ultraviolet light stabilizer can be 0.005, 0.01, 0.02, 0.05, 0.08, 0.1, 0.2, 0.3, 0.5, 0.8, 1, 1.2, 1.5, 2, and any number between these values, preferably 0.05-2 parts by weight, and more preferably 0.1-1 parts by weight.

[0030] In one embodiment of the present invention, the coupling agent is selected from silicate coupling agents and / or phthalate coupling agents, preferably silicate coupling agents;

[0031] Wherein, in the present invention, the silicate coupling agent is selected from n-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 3,3,3-trifluoropropylmethyldimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(2-methoxyethoxy)silane, vinyltriperoxytert-butylsilane, isocyanatepropyltrimethoxysilane, isocyanatepropyltriethoxysilane, vinyltriacetoxysilane, vinyltriperoxytert-butylsilane, γ-methacryloxypropyltrimethoxysilane, 3-glycidylpropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-(2,3-epoxypropyloxy)-propylmethyldiethoxysilane, methyltrimethoxysilane, The invention can be selected from the group consisting of triethoxysilane, methyltri(2-methoxyethoxy)silane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltri(2-methoxyethoxy)silane, hexyltrimethoxysilane, hexyltriethoxysilane, octyltrimethoxysilane, octyltriethoxysilane, decyltrimethoxysilane, decyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, tetradecyltrimethoxysilane, tetradecyltriethoxysilane, hexadecyltrimethoxysilane, hexadecyltriethoxysilane, octadecyltrimethoxysilane, octadecyltriethoxysilane and γ-methacryloxypropyltri(2-methoxyethoxy)silane.

[0032] In one embodiment of the present invention, the UV stabilizer is a hindered amine stabilizer, preferably selected from 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, mono(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (CAS#82919-37-7), bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (CAS#41556-26-7), bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate (UV 123, CAS#129757-67-1), bis(2,2,6,6-tetramethylpiperidinyl) sebacate (UV770, CAS#52829-07-9), poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate (UV622, CAS#65447-77-0), 2,2,6,6-tetramethyl-4-piperidinyl fatty acid ester (fatty acid carbon length C8-C22, saturated or unsaturated), poly{[6-[(1,1,3,3-tetramethyl 1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]}, N,N"'-1,2-ethanediylbis[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]amino]propyl]-N,N"-dibutyl-N,N"-di(1,2,2, One or more of: tris(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazine-2,4,6-triamine, tris(1,2,2,6,6-pentamethyl-4-piperidinyl)phosphite, N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine, 2,4,6-trichloro-1,3,5-triazine and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate.

[0033] In one embodiment of the present invention, the raw materials for preparing the mask further include one or more of an antioxidant, an ultraviolet absorber, an adhesion promoter (epoxy compounds), and a filler (titanium dioxide, silicon oxide, glass powder, etc.). Among them, all the modifying additives available in the field of curing film formation can be used in the present invention, and the present invention will not repeat them one by one.

[0034] The second aspect of the present invention provides a method for preparing a mask, wherein the method comprises thermally spraying the coating material described in the first aspect of the present invention into a film.

[0035] The present invention does not specifically limit the preparation method of the spray film, and any thermal spray film forming method known in the art can be used in the present invention. For example, in the present invention, the coating described in the first aspect of the present invention can be heated to 60-100°C and then injected into the spraying equipment, and then the substrate is sprayed, and then naturally cooled after spraying until the coating solidifies to obtain a mask.

[0036] The third aspect of the present invention provides a mask prepared by the preparation method described in the second aspect of the present invention.

[0037] Among them, the mask prepared in the present invention is a transparent film with high light transmittance (not less than 91.0%), high volume resistivity (not less than 1.0E15Ω·cm), good water resistance (48-hour PCT yellowing index △Y not exceeding 4), high bonding strength with battery cells, water and vapor resistance, and low cost.

[0038] The present invention will be described in detail below through examples. The test conditions of MI are 190°C / 2.16kg.

[0039] Example 1

[0040] (1) Weighing 100 g of an ethylene-octene copolymer (the content of ethylene structural units is 70 wt %, and the MI is 17 g / 10 min) and 400 g of a solvent of xylene, heating to 140° C. in a three-necked flask with a condenser, stirring, and refluxing until the ethylene-octene copolymer is completely dissolved to obtain a transparent clear solution;

[0041] Then cool to 60°C, add 0.5g of vulcanizing agent dibenzoyl peroxide, 0.5g of crosslinking agent triallyl isocyanurate, 1g of coupling agent γ-(methacryloyloxy)propyl trimethoxysilane, 0.1g of ultraviolet light stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, maintain at 60°C, wait until all are dissolved, and obtain a coating;

[0042] (2) The coating is injected into a spraying device for spraying to obtain a mask.

[0043] Example 2

[0044] (1) Weighing 100 g of ethylene-vinyl acetate copolymer (vinyl acetate structural unit content 28%, MI 25 g / min) and 400 g of xylene solvent, heating to 140° C. in a three-necked flask with a condenser, stirring, and reflux until the ethylene-vinyl acetate copolymer is completely dissolved to obtain a transparent clear solution;

[0045] Then cool to 60°C, add 0.5g of vulcanizing agent dibenzoyl peroxide, 0.5g of crosslinking agent trimethylolpropane triacrylate, 1g of coupling agent γ-(methacryloyloxy)propyltrimethoxysilane, and 0.1g of ultraviolet light stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, maintain at 60°C, and wait until all are dissolved to obtain a coating;

[0046] (2) The coating is injected into a spraying device for spraying to obtain a mask.

[0047] Example 3

[0048] (1) Weighing 100 g of ethylene-vinyl acetate copolymer (vinyl acetate structural unit content 38%, MI 30 g / min) and 400 g of xylene solvent, heating to 140° C. in a three-necked flask with a condenser, stirring, and reflux until the ethylene-vinyl acetate copolymer is completely dissolved to obtain a transparent clear solution;

[0049] Then cool to 60°C, add 0.5g of vulcanizing agent tert-butyl peroxy-2-ethylhexyl carbonate, 0.5g of crosslinking agent (0.25g of trimethylolpropane triacrylate and 0.25g of triallyl isocyanurate), 1g of coupling agent γ-(methacryloyloxy)propyl trimethoxysilane, 0.1g of ultraviolet light stabilizer bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, maintain at 60°C, wait until all are dissolved, and obtain a coating;

[0050] (2) The coating is injected into a spraying device for spraying to obtain a mask.

[0051] Example 4

[0052] Compared with Example 1, the difference is that the coupling agent and the ultraviolet light stabilizer are omitted.

[0053] Comparative Example 1

[0054] The same as Example 1, except that the ethylene-octene copolymer is replaced by low-density polyethylene (trade name 582E, from DOW) in equal amount.

[0055] Comparative Example 2

[0056] The same as Example 1, except that the ethylene-octene copolymer is replaced by an equal amount of polyurethane acrylic resin (trade name CN965, from Sartomer).

[0057] Test Example 1

[0058] The coatings were prepared with reference to Examples 1-4 and Comparative Examples 1-2, and were coated on release films respectively. After drying, the coatings were cured at 150° C. for 15 min to obtain a standard film with a thickness of 200 μm. The transmittance, volume resistance and aging properties of the standard film are shown in Table 1.

[0059] The transmittance was tested using a UV-visible spectrophotometer with a test range of 380-1100nm. The volume resistivity was tested using a high resistance tester in accordance with GB / T 1410-2006.

[0060] Aging performance test method: Place the standard film sample in a PCT aging test chamber and let it stand for 48 hours (aging chamber conditions: temperature 121℃±0.5℃, relative humidity 99%~100%), then take it out, inspect its appearance, and measure the yellowing index with a colorimeter.

[0061] Table 1

[0062]

[0063]

[0064] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A coating for preparing a mask, characterized in that: The raw materials for preparing the coating include: 100 parts by weight of a mask precursor, 0.05-5 parts by weight of a vulcanizing agent, 0.05-8 parts by weight of a cross-linking agent and 10-5000 parts by weight of an organic solvent; wherein the mask precursor is selected from one or more of olefin copolymers, fluorine-containing organic compounds, silicones, polyacrylic acid, polyacrylates, polyurethanes, polycarbonates, epoxy resins and polyimides.

2. The coating according to claim 1, wherein The raw materials for preparing the coating include: 100 parts by weight of a mask precursor, 0.05-2 parts by weight, preferably 0.1-1 parts by weight of a vulcanizing agent, 0.05-2 parts by weight, preferably 0.1-1 parts by weight of a cross-linking agent, and 50-2000 parts by weight, preferably 200-1000 parts by weight of an organic solvent; Wherein, based on 100 parts by weight of the mask precursor, the sum of the weight parts of the vulcanizing agent and the cross-linking agent is 0.1-3 parts by weight, preferably 0.2-1.5 parts by weight.

3. The coating according to claim 1 or 2, wherein The mask precursor is an olefin copolymer; wherein the olefin copolymer is selected from one or more of polyolefin elastomer, poly-1-butene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, preferably polyolefin elastomer and / or ethylene-vinyl acetate copolymer; Preferably, the polyolefin elastomer is a polymerization product of ethylene and α-olefin; wherein the α-olefin is selected from C2-C 12 Straight or branched α-olefins; Preferably, the content of ethylene structural units in the polyolefin elastomer is ≥10wt%, preferably 50-90wt%; the melt index (MI, test conditions 190°C / 2.16kg) is not less than 2g / 10min, preferably 5-100g / 10min; Preferably, the polyolefin elastomer is selected from one or more of ethylene-octene copolymer, ethylene-butene copolymer and ethylene-hexene copolymer; Preferably, the content of vinyl acetate structural units in the ethylene-vinyl acetate copolymer is 10-40wt%, preferably 20-40wt%; and the melt index (MI, testing conditions 190°C / 2.16kg) is 10-10000g / 10min.

4. The coating according to any one of claims 1 to 3, wherein The vulcanizing agent is an organic peroxide vulcanizing agent; wherein the organic peroxide vulcanizing agent is selected from di-tert-butyl peroxide, tert-butyl hydroperoxide, tert-butyl peroxybenzoate, dibenzoyl peroxide, diisopropyl peroxide, di(tert-butyl peroxyisopropyl)benzene, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-butyl peroxyisopropyl formate, tert-butyl peroxyisopropylbenzene, tert-butyl peroxy-2-ethylhexyl carbonate, tert-butyl peroxyisopropyl carbonate, tert-amyl peroxy(2-ethylhexyl) carbonate, ethyl 3,3-di(tert-butylperoxy)butyrate, tert-butyl peroxy-3,5,5-trimethylhexanoate, n-butyl 4,4-di(tert-butylperoxy)valerate, 2,5-dimethyl-2,5-di-tert-butylperoxy-3-hexyne, 1,4-di- One or more of tert-butyl peroxyisopropylbenzene, 1,3-di-tert-butyl peroxyisopropylbenzene, bis(4-methylbenzoyl) peroxide, 3,5,7,7-pentamethyl-1,2,4-trioxepane, dilauroyl peroxide, tert-amyl peroxide-2-ethylhexanoate, 2-ethylperoxyhexanoic acid-1,1,3,3-tetramethylbutyl ester, tert-butyl peroxide diethyl acetate, tert-butyl peroxide-2-ethylhexanoate, tert-butyl peroxide isobutyrate, 1,1'-azo(cyanocyclohexane), 1,1-bis(tert-amylperoxy)cyclohexane, tri-amyl peroxide acetate, 1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 2,2-bis(tert-butylperoxy)butane, 1,1-di(tert-butylperoxy)cyclohexane, and tert-butyl peroxyneodecanoate.

5. The coating according to any one of claims 1 to 4, wherein The crosslinking agent is selected from triallyl isocyanurate, triallyl cyanurate, tris(2-hydroxyethyl)isocyanuric acid triacrylate, tris(2-hydroxyethyl)isocyanuric acid trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane trimethacrylate, propoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane trimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol diacrylate, neopentyl glycol acrylate, One or more of dimethacrylate, diethylene glycol diacrylate, diethylene glycol dimethacrylate, cyclohexanedimethanol-1,4-diacrylate, cyclohexanedimethanol-1,4-dimethacrylate, poly(ethylene glycol) diacrylate, poly(ethylene glycol) dimethacrylate, poly(propylene glycol) diacrylate, poly(propylene glycol) dimethacrylate, ditrimethylolpropane tetraacrylate, ditrimethylolpropane tetramethacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, tetramethyltetravinylcyclotetrasiloxane, trimethyltrivinylcyclotrisiloxane, vinyl-terminated polydimethylsiloxane, propoxylated allyl methacrylate, divinylbenzene, and diallyl phthalate.

6. The coating according to any one of claims 1 to 5, wherein Based on 100 parts by weight of the mask precursor, the raw materials for preparing the coating further include 0.05-2 parts by weight, preferably 0.08-1.6 parts by weight of a coupling agent and 0.005-2 parts by weight, preferably 0.05-2 parts by weight of an ultraviolet light stabilizer.

7. The coating according to claim 6, wherein The coupling agent is selected from silicate coupling agents and / or phthalate coupling agents, preferably silicate coupling agents; wherein the silicate coupling agent is selected from n-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, 3,3,3-trifluoropropylmethyldimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(2-methoxyethoxy)silane, vinyltriperoxytert-butylsilane, isocyanatepropyltrimethoxysilane, isocyanatepropyltriethoxysilane, vinyltriacetoxysilane, vinyltriperoxytert-butylsilane, γ-(methacryloyloxy)propyltrimethoxysilane, 3-glycidylpropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-(2,3-epoxypropyloxy)-propylmethyldiethoxysilane, The invention can be selected from the group consisting of methyl silane, methyl trimethoxysilane, methyl triethoxysilane, methyl tri(2-methoxyethoxy)silane, ethyl trimethoxysilane, ethyl triethoxysilane, ethyl tri(2-methoxyethoxy)silane, hexyl trimethoxysilane, hexyl triethoxysilane, octyl trimethoxysilane, octyl triethoxysilane, decyl trimethoxysilane, decyl triethoxysilane, dodecyl trimethoxysilane, dodecyl triethoxysilane, tetradecyl trimethoxysilane, tetradecyl triethoxysilane, hexadecyl trimethoxysilane, hexadecyl triethoxysilane, octadecyl trimethoxysilane, octadecyl triethoxysilane, and γ-methacryloxypropyl tri(2-methoxyethoxy)silane.

8. The coating according to claim 6, wherein The ultraviolet light stabilizer is a hindered amine stabilizer, preferably selected from 3,5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, mono(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis(2,2,6,6-tetramethyl-4 -piperidinyl) sebacate, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate, 2,2,6,6-tetramethyl-4-piperidinyl fatty acid ester, poly{[6-[(1,1,3,3-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino]-1,6-hexanediol[(2,2,6,6-tetramethylbutyl)amino]]-1,3,5-triazine-2,4-[(2,2,6,6,-tetramethyl-piperidinyl)imino] methyl-4-piperidinyl)imino]}, N,N"'-1,2-ethanediylbis[N-[3-[[4,6-di[butyl(1,2,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl]amino]propyl]-N,N"-dibutyl-N,N"-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-1,3,5-triazine-2,4,6-triamine , tris(1,2,2,6,6-pentamethyl-4-piperidinyl)phosphite, N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-1,6-hexanediamine, 2,4,6-trichloro-1,3,5-triazine and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)sebacate.

9. A method for preparing a mask, wherein: The method comprises thermally spraying the coating material according to any one of claims 1 to 8 into a film.

10. A mask prepared by the preparation method according to claim 9.

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