Coating for modified acrylate backboard as well as preparation method and application of coating

Abstract

The invention relates to a coating for a modified acrylate backboard as well as a preparation method and application of the coating. The coating comprises perfluoropolyether, fluorosilicone acrylate, a UV absorbent, a light stabilizer, an antioxidant, a curing agent A, a curing agent B, a thixotropic agent and a reflecting agent. The coating for the modified acrylate backboard is prepared by introducing special fluorosilicone acrylate, the coating can be used for silk-screen printing of the backboard of a light flexible photovoltaic module, the weather resistance and the water resistance of a backboard material are improved, and the problems that the weather resistance and the water resistance of a coating are poor due to the fact that the silk-screen thickness is too low are solved.

Description

Technical Field

[0001] The invention belongs to the field of lightweight components, and particularly relates to a coating for a modified acrylic ester backboard, and a preparation method and application thereof. Background Art

[0002] Lightweight components are widely used in the field of BIPV construction because of their low requirements for installation structure and light weight. In order to improve the rigidity of lightweight components, PP reinforced composite materials are usually used as the backplane material in the components with composite front films. Because PP materials have poor UV resistance and low surface dyne value, they are not easy to bond with adhesive films. Usually, a weather-resistant coating is screen-printed or roller-coated on the surface of the PP composite backplane. In photovoltaic components, based on battery efficiency and other reasons, the battery cells are changed from PERC to Topcon, which puts higher requirements on the barrier properties of the backplane.

[0003] In patent CN116535965B, polyurethane acrylate oligomers and silicone-modified acrylate oligomers are used as barrier layers to prepare low water permeability barrier layers, which are cured by UV light and used for component backplanes. The silicone-modified acrylate has a single function and other weather-resistant layers and film bonding layers are required. For composite materials with a thickness of more than 0.6 mm, the cost of compounding the three layers together is relatively high.

[0004] In the patent CN116333576B, 40% to 60% fluorocarbon resin is used as a weathering additive, and a rare earth doped down-conversion material modified by a fluorosilane polymer is added to replace the traditional UV absorber to convert UV into visible light and increase the power generation efficiency of the module. However, for flexible modules, the front film has blocked more than 90% of UV, the efficiency of the light conversion agent is low, and the transition metal is not conducive to the long-term outdoor weathering performance of the material. It is also easy to be enriched during production, resulting in reduced production efficiency.

[0005] In patent CN118198163A, the water-blocking performance of the backplane is improved by adding aluminum foil. However, the insulation thickness and PID performance of the material after adding aluminum require glue packaging and isolation. Its reliability is difficult to guarantee, and it is difficult to achieve fully automated production at the component packaging end. Therefore, it is less used. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a modified acrylate backplane coating, a preparation method and application thereof. By introducing special fluorosilicone acrylate, a modified acrylate backplane coating is prepared. The coating can be used for silk screen printing of lightweight flexible photovoltaic module backplanes, thereby improving the weather resistance and water barrier properties of the backplane material, and solving the problem of poor weather resistance and water barrier properties of the coating due to low silk screen thickness.

[0007] The present invention provides a modified acrylic ester backboard coating, which comprises the following components in parts by mass: 15-40 parts of perfluoropolyether; Fluorosilicone acrylate 20-50 parts; UV absorber 0.5-1 part; Light stabilizer 0.5-1 part; Antioxidant 0.5-1 part; Curing agent A 5-10 parts; Curing agent B 5-10 parts; 1-3 parts of thixotropic agent; Reflective agent 2-10 parts; Wherein, the fluorosilicone acrylate comprises the following components: Polyurethane modified acrylate 10-40 parts; 10-30 parts of hydroxy acrylate; 10-30 parts of fluorinated acrylate; 10-30 parts of organosilicon modifier; Active diluent 5-10 parts; 100 parts of solvent.

[0008] Preferably, the curing agent A is an isocyanate curing agent, such as HDI, IPDI, etc.

[0009] Preferably, the curing agent B is a blocked polyisocyanate curing agent, the blocking agent is one of diethyl malonate, methyl ethyl ketone oxime, acetone oxime, and ε-caprolactam, and the NCO content is >8wt%.

[0010] Preferably, the perfluoropolyether is a perfluoropolyether with dihydroxyl groups as terminal groups.

[0011] Preferably, the UV absorber is one or more of UV1164, UV1577, and UV400.

[0012] Preferably, the light stabilizer is one or more of UV1130 and UV928.

[0013] Preferably, the antioxidant is one or more of antioxidants 1076, 1098, and 1010.

[0014] Preferably, the thixotropic agent is fumed silicon dioxide SiO2.

[0015] Preferably, the reflective agent is titanium dioxide.

[0016] Preferably, the hydroxy acrylate is one or more of 2-hydroxyethyl acrylate, hydroxyethyl methacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, hydroxyethyl acrylate, tripropylene glycol triacrylate, and pentaerythritol triacrylate.

[0017] Preferably, the fluorine-containing acrylate is one or more of methyl 2-(trifluoromethyl)acrylate, ethyl 2-(trifluoromethyl)acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, tert-butyl 2-(trifluoromethyl)acrylate, and 1,1,1-trifluoro-2-(trifluoromethyl)-2-hydroxy-4-methyl-5-pentyl methacrylate.

[0018] Preferably, the organosilicon modifier is one or more of 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane and 3-acryloxypropyltriethoxysilane.

[0019] Preferably, the reactive diluent is one or more of ethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, 1,3-butanediol dimethacrylate, and 1,6-hexanediol dimethacrylate.

[0020] Preferably, the solvent is toluene or xylene.

[0021] The present invention also provides a method for preparing a modified acrylic ester backboard coating, comprising the following steps: (1) According to the formula ratio, polyurethane modified acrylate, hydroxy acrylate, fluorinated acrylate, organosilicon modifier, and reactive diluent are added to the solvent and mixed, and then an initiator is added, and the mixture is stirred and reacted for 0.5-2 hours under heating in a water bath at 80-90° C. to obtain fluorosilicone acrylate; (2) Add perfluoropolyether, UV absorber, light stabilizer, antioxidant, curing agent A, curing agent B, thixotropic agent and reflective agent to the above fluorosilicone acrylate according to the formula ratio, stir and react for 1-4 hours under heating in a water bath at 80-100° C. to obtain a modified acrylate backplane coating.

[0022] Preferably, the initiator in step (1) is one or more of benzoyl peroxide, azobisisobutyronitrile, and diisopropylbenzene peroxide; the amount of the initiator added is 0.1%-0.5% of the mass of the solvent; and the solvent of the initiator solution is toluene.

[0023] The present invention also provides an application of a modified acrylic ester backboard coating in a lightweight flexible photovoltaic module.

[0024] Beneficial Effects (1) In addition to using perfluoropolyether, the present invention polymerizes fluorosilicone acrylate on the main chain through a chemical reaction to prepare a modified acrylate backplane coating. The coating can be used for silk screen printing of lightweight flexible photovoltaic module backplanes to improve the weather resistance and water barrier properties of the backplane material, thereby solving the problem of poor weather resistance and water barrier properties of the coating due to low silk screen thickness.

[0025] (2) Compared with conventional hydroxy acrylate, the fluorosilicone acrylate added in the present invention increases the cohesive energy of the coating, thereby increasing the weather resistance of the coating, and significantly improving the adhesion and water barrier properties.

[0026] (3) The polyurethane modified acrylate in the fluorosilicone acrylate added in the present invention toughens the resin, and reduces the problem of reduced coating adhesion due to the addition of reflective agents without increasing the free volume. The addition of reflective agents makes the reflectivity of 550nm light greater than 85% at a coating thickness of 5-20μm, thereby improving the efficiency of photovoltaic modules.

[0027] (4) The curing agent A and curing agent B added in the present invention avoid the problems of low curing degree, uneven molecular weight distribution, monomer residue and the like caused by a single curing agent. The dual curing agents increase the crosslinking degree of fluorosilicone acrylate, thereby improving the water barrier properties of the material. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0029] Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0030] Table 1 Formula of fluorosilicone acrylate (parts by weight)

[0031] The preparation method of the fluorosilicone acrylate comprises the following steps: According to the formula ratio, polyurethane modified acrylate, hydroxy acrylate, fluorine-containing acrylate, silicone modifier and active diluent are added to the solvent and mixed, and then the initiator is added. The mixture is stirred and reacted for 0.5 h in a water bath at 80° C. to obtain fluorosilicone acrylate.

[0032] Table 2 Formula of modified acrylic backsheet coating (parts by weight)

[0033] Table 3 Formula of modified acrylic backsheet coating (parts by weight)

[0034] The preparation method of the modified acrylic ester backboard coating comprises the following steps: According to the formula ratio, perfluoropolyether, UV absorber, light stabilizer, antioxidant, curing agent A, curing agent B, thixotropic agent and reflective agent are added to the above-mentioned fluorosilicone acrylate, and the mixture is stirred and reacted for 2 hours under heating in a water bath at 80°C to obtain a modified acrylate backplane coating.

[0035] The method for using the modified acrylic backboard coating comprises the following steps: 1. Mix the paint evenly; 2. Use 120 mesh screen to screen print on PP composite material with 0.65mm glass fiber content of 70wt%; 3. The drying tunnel is 50m, the temperature is as shown in the table below, and the line speed is 50m / min for baking and curing;

[0036] 4. After screen printing, post-curing treatment is carried out, and the material properties are tested after constant temperature of 155℃ for 10 minutes.

[0037] Table 4 Material performance test

[0038] Table 5 Material performance test

Claims

1. A modified acrylic backboard coating, characterized in that: By mass, it includes the following components: 15-40 parts of perfluoropolyether; Fluorosilicone acrylate 20-50 parts; UV absorber 0.5-1 part; Light stabilizer 0.5-1 part; Antioxidant 0.5-1 part; Curing agent A 5-10 parts; Curing agent B 5-10 parts; 1-3 parts of thixotropic agent; Reflective agent 2-10 parts; Wherein, the fluorosilicone acrylate comprises the following components: Polyurethane modified acrylate 10-40 parts; 10-30 parts of hydroxy acrylate; 10-30 parts of fluorinated acrylate; 10-30 parts of organosilicon modifier; Active diluent 5-10 parts; 100 parts of solvent; The curing agent A is an isocyanate curing agent; the curing agent B is a blocked polyisocyanate curing agent.

2. The modified acrylic backboard coating according to claim 1, characterized in that: The perfluoropolyether is a perfluoropolyether with dihydroxyl groups as terminal groups.

3. The modified acrylic backboard coating according to claim 1, characterized in that: The UV absorber is one or more of UV1164, UV1577, and UV400; the light stabilizer is one or more of UV1130 and UV928; and the antioxidant is one or more of antioxidants 1076, 1098, and 1010.

4. The modified acrylic ester backboard coating according to claim 1, characterized in that: The thixotropic agent is fumed silicon dioxide SiO2; the reflective agent is titanium dioxide.

5. The modified acrylic backboard coating according to claim 1, characterized in that: The hydroxy acrylate is one or more of 2-hydroxyethyl acrylate, hydroxyethyl methacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, hydroxyethyl acrylate, tripropylene glycol triacrylate, and pentaerythritol triacrylate.

6. The modified acrylic backboard coating according to claim 1, characterized in that: The fluorine-containing acrylate is one or more of 2-(trifluoromethyl)methyl acrylate, 2-(trifluoromethyl)ethyl acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 2-(trifluoromethyl)tert-butyl acrylate, and 1,1,1-trifluoro-2-(trifluoromethyl)-2-hydroxy-4-methyl-5-pentyl methacrylate.

7. The modified acrylic ester backboard coating according to claim 1, characterized in that: The organosilicon modifier is one or more of 3-methacryloxypropyl trimethoxysilane, 3-methacryloxypropyl triethoxysilane, and 3-acryloxypropyl triethoxysilane; the active diluent is one or more of ethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, 1,3-butanediol dimethacrylate, and 1,6-hexanediol dimethacrylate; and the solvent is toluene or xylene.

8. A method for preparing the modified acrylic ester backboard coating according to any one of claims 1 to 7, comprising the following steps: (1) According to the formula ratio, polyurethane modified acrylate, hydroxy acrylate, fluorinated acrylate, organosilicon modifier, and reactive diluent are added to the solvent and mixed, and then an initiator is added, and the mixture is stirred and reacted for 0.5-2 hours under heating in a water bath at 80-90° C. to obtain fluorosilicone acrylate; (2) Add perfluoropolyether, UV absorber, light stabilizer, antioxidant, curing agent A, curing agent B, thixotropic agent and reflective agent to the above fluorosilicone acrylate according to the formula ratio, stir and react for 1-4 hours under heating in a water bath at 80-100° C. to obtain a modified acrylate backplane coating.

9. Use of the modified acrylic backboard coating as claimed in any one of claims 1 to 7 in a lightweight flexible photovoltaic module.

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