CN-119307218-B - High-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive and preparation method thereof

Abstract

The application discloses a high-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive and a preparation method thereof, wherein the high-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive comprises, by weight, 40-60 parts of photo-curing acrylic ester, 34-44 parts of reactive diluents, 0.5-4 parts of photoinitiators, 0.05-3.5 parts of first polymerization inhibitors and 1-6 parts of auxiliary agents, and the photo-curing acrylic ester has the structure shown in the specification, wherein A- (B-C) x is a heterocyclic compound containing urea bonds, B is an alicyclic diisocyanate monomer, C is a hydroxyl-containing acrylic acid derivative, and x is from 1 to 5. The photovoltaic adhesive disclosed by the application can meet the general requirements of the photovoltaic adhesive, has high adhesive force, moisture and heat resistance, ageing resistance and yellowing resistance, and is matched with a low-temperature tin-coated welding strip, so that double fixing of the welding strip and a battery piece is realized, the stripping force between the welding strip and the battery piece is greatly improved, the traditional infrared and external thermal welding is replaced, and the realizability is provided for lightening and thinning of the battery piece at the component end and reducing the cost and the energy.

Inventors

• LI JIANBO
• TAN HAO
• LENG JUNZHAO
• WANG TAO
• NIE LEI
• ZHAO WENFENG

Assignees

• 苏州合邦鑫材科技有限公司

Dates

Publication Date

20260508

Application Date

20241106

Claims (7)

1. 1. The high-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive is characterized by comprising, by weight, 40-60 parts of photo-curing acrylic ester, 34-44 parts of reactive diluent, 0.5-4 parts of photoinitiator, 0.05-3.5 parts of first polymerization inhibitor and 1-6 parts of auxiliary agent, wherein the photo-curing acrylic ester has a structure as shown in the general formula (I): A-(B-C) x (I) wherein A is a heterocyclic compound containing urea bond, B is alicyclic diisocyanate monomer, C is a hydroxyl-containing acrylic acid derivative, and x is from 1 to 5; Wherein A in the general formula of the photo-curing acrylate is selected from the following formula (II) or One of (III), wherein n is from 1 to 4; The photo-curing acrylic ester comprises the following preparation steps: s1, mixing an alicyclic diisocyanate monomer, a first catalyst, an antioxidant and a second polymerization inhibitor under a light-shielding condition, dropwise adding a hydroxyl-containing acrylic acid derivative at 40-50 ℃, and obtaining an intermediate product 1 when the NCO content in the reaction reaches 50% of an initial theoretical value; S2, mixing a heterocyclic compound containing urea bonds with a second catalyst under a light-shielding condition, heating to 60-80 ℃ and dropwise adding the intermediate product 1, and reacting until the NCO mass content is 0.1%, thereby obtaining the light-cured acrylic ester; in the step S1, the molar ratio of the alicyclic diisocyanate monomer to the hydroxyl-containing acrylic acid derivative is 1 (1-1.3); in the step S2, the molar ratio of the molar quantity of the alcoholic hydroxyl groups in the heterocyclic compound containing urea bonds to the molar ratio of the intermediate product 1 is (0.8-1): 1; The mass ratio of the photo-curing acrylic ester to the diluent is 1 (0.7-0.9).
2. 2. The high adhesion wet heat resistance yellowing resistant photovoltaic adhesive according to claim 1, wherein the cycloaliphatic diisocyanate monomer is selected from one or more of cyclopentylene-1, 3-diisocyanate, cyclohexylene-1, 4-diisocyanate, cyclohexylene-1, 2-diisocyanate, 4' -dicyclohexylmethane diisocyanate, 1-isocyanato-2-diisocyanatodicyclopentane, isophorone diisocyanate, 2, 4-dicyclohexylmethane diisocyanate, bis- (4-isocyanato-3-methylcyclohexyl) -methane; the hydroxyl-containing acrylic acid derivative is selected from one or more of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxybutyl acrylate, hydroxyethyl acrylamide, hydroxypropyl methacrylate and hydroxypropyl acrylate.
3. 3. The high adhesion wet heat resistance yellowing resistant photovoltaic adhesive according to claim 1, wherein said reactive diluent is selected from one or more of isobornyl acrylate, isobornyl methacrylate, isooctyl acrylate, isooctyl methacrylate, tetrahydrofuranyl acrylate, tetrahydrofuranyl methacrylate, trimethylolpropane triacrylate, 2-phenoxyethyl acrylate, ethoxylated trimethylolpropane triacrylate, 1, 6-hexanediol diacrylate, 1, 4-butanediol diacrylate, n-butyl acrylate, isodecyl acrylate, lauric acid acrylate, cyclohexyl acrylate, 3, 5-trimethylcyclohexyl acrylate, 4-t-butylcyclohexyl acrylate, biscyclopentenyl acrylate, pentaerythritol tetraacrylate, and cyclotrimethylolpropane methylal acrylate.
4. 4. The high adhesion wet heat resistance yellowing resistant photovoltaic adhesive according to claim 1, wherein said photoinitiator is selected from one or more of bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 2-methyl-1- [4- (methylthio) phenyl ] -2- (4-morpholino) -1-propanone, 2-hydroxy-4- (2-hydroxyethoxy) -2-methylpropenyl propanone, (2, 4, 6-trimethylbenzoyl) diphenylphosphine oxide, ethyl 2,4, 6-trimethylbenzoyl phenylphosphonate, 2-dimethoxy-2-phenylacetophenone, methyl benzoate, isopropylthioxanthone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and 1-hydroxycyclohexylphenyl methanone.
5. 5. The high adhesion wet heat resistance yellowing resistant photovoltaic adhesive according to claim 1, wherein the auxiliary agent is one or more selected from the group consisting of stabilizers, antioxidants, adhesion promoters, coupling agents, defoamers, leveling agents, sizing agents, leveling agents, toughening agents, flame retardants, pigments and fillers.
6. 6. A method for preparing the high-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive according to any one of claims 1 to 5, comprising the following steps: Mixing the photo-curing acrylic ester, the reactive diluent, the photoinitiator, the first polymerization inhibitor and the auxiliary agent, and stirring for 1-5 hours under the conditions of vacuum degree of-0.005 MPa to-0.2 MPa and temperature of 20-40 ℃ to obtain the high-adhesion wet-heat-resistant yellowing-resistant photovoltaic adhesive.
7. 7. The high adhesion wet heat resistance yellowing resistant photovoltaic adhesive according to claim 1, wherein said first and second catalysts are each selected from one or more of organotin, organobismuth, organozinc, organocobalt and organic base based catalysts.

Description

High-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive and preparation method thereof Technical Field The invention relates to the technical field of adhesives, in particular to a high-adhesion moisture-heat-resistant yellowing-resistant photovoltaic adhesive and a preparation method thereof. Background With the rapid development of socioeconomic and population, the demand for energy is also increasing. The solar energy is used as a new energy source, and the main source of the new energy source is sunlight radiated by the sun, so that the new energy source has huge reserve and is environment-friendly. Photovoltaic power generation is a technology that uses the photovoltaic effect of a semiconductor interface to convert light energy into electrical energy. In industrial use, solar cells need to be assembled in a serial or parallel manner, so that a higher output voltage can be obtained. The photovoltaic module is the smallest unit of photovoltaic power generation. In the production process of the photovoltaic module, how to use the single solar cell in series or in parallel not only relates to the photoelectric conversion efficiency of the photovoltaic module, but also influences the difficulty of the production process. The series connection may increase the voltage of the entire battery array, while the parallel connection may increase the current. The performance of the photovoltaic solder strip, which is used as a key material for connecting the battery pieces, has a direct influence on the efficiency and the service life of the assembly. The use of photovoltaic solder strip connection has been considered one of the most mature ways of packaging photovoltaic modules. In order to reduce silver consumption, improve power and improve yield, the main grid is canceled in the existing battery piece links, and the current is led out by the welding belt in the component links. The photovoltaic solder strip dispensing technology is a key link in the production of photovoltaic modules, and the process comprises the steps of firstly welding a solder strip on a battery piece, then dispensing the glue to further adhere the solder strip on the battery piece, and finally laminating and alloying. This solution differs from the glue-only lamination solution in that it requires welding, which achieves a preliminary fixation, whereas the glue-dispensing is further fixed. Because high temperature is used in the welding process, an adhesive capable of bearing high temperature is needed in the dispensing process, and the bonding strength is high. Thus, the connection between the welding strip and the battery piece can be ensured to be firm and reliable. Because the solar cell slice has the defects of thinness, brittleness, easy oxidation and the like, the solar cell slice is easy to permanently damage when exposed in natural environments such as air, rainwater and the like. Therefore, the photovoltaic adhesive is used for connecting and sealing photovoltaic modules, and has good bonding strength, and also has good ultraviolet exposure resistance, yellowing resistance, damp heat resistance, ageing resistance and the like, so as to meet the requirements of the use environment. However, the performance of the photovoltaic glue sold in the market at present is still difficult to meet the use requirement. The patent CN117384580A discloses a high-thixotropic high-temperature-resistant yellowing-resistant photovoltaic solder strip UV adhesive, which comprises, by mass, 40-60 parts of an oligomer, 30-40 parts of an active monomer, 1-5 parts of a modified mixed powder, 1-5 parts of a surface layer photoinitiator and 0.5-1 part of a deep layer photoinitiator, wherein the modified mixed powder is added in a formula system of the UV adhesive, and the unique rheological property of the mixed powder is utilized to prevent the adhesive from spreading before solidification, so that a large area of a battery piece is prevented from being polluted, boron nitride with high heat transfer efficiency is arranged in the mixed powder of the UV adhesive, heat can be quickly transferred, the main temperature of the UV adhesive is prevented from being too high, the temperature resistance of the UV adhesive is improved, and the high-temperature problem caused by short circuit resistance of the assembly is ensured. Therefore, development of a photovoltaic adhesive with high adhesive force, moisture and heat resistance, aging resistance and yellowing resistance is still a problem to be solved. Disclosure of Invention In order to solve the problems, the invention provides the photovoltaic adhesive with high adhesion, moisture resistance, heat resistance, aging resistance and yellowing resistance and the preparation method thereof, and the requirements of high adhesion, moisture resistance, heat resistance, aging resistance and yellowing resistance in the prior art can be overcome by changing the types of main resins and under the