Adhesive for protective film on the back of a solar cell and application thereof

A backside protective film, solar cell technology, applied in the direction of film/sheet adhesives, adhesives, adhesive types, etc., can solve the problems of high adhesive viscosity, difficult processing and construction, etc., to achieve hydrolysis resistance The effect of lifting, high peel strength between layers, and excellent processability

Active Publication Date: 2020-10-09
SUZHOU GOLDEN TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an adhesive for the protective film on the back of a solar cell and its application, which is used to solve the problems of high viscosity of the current adhesive and difficulty in processing and construction

Method used

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  • Adhesive for protective film on the back of a solar cell and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The adhesive for the protective film on the back of the solar cell comprises the following components by weight: 100 parts of polyester resin and 20 parts of melamine formaldehyde resin.

[0031] The preparation method of the melamine formaldehyde resin is as follows: add melamine to the formaldehyde aqueous solution with a pH value of 8-8.5, heat up to 70°C and keep it warm, and continue the heat preservation reaction for half an hour after the system is clarified, then cool down to 40°C, and add methanol , and then adjust the pH value to 5-6, raise the temperature to 50° C. for 1 hour, and adjust the pH value to 8-9 again to obtain the desired melamine formaldehyde resin. The molar ratio of the melamine to formaldehyde is 1:3, and the molar ratio of the melamine to methanol is 1:15.

[0032] Wherein the polyester resin is a polycarboxylic acid and a polyhydric alcohol copolymer, and the polycarboxylic acid contains 60mol% of a mixture of phthalic acid, terephthalic ac...

Embodiment 2

[0036] The adhesive for the protective film on the back of the solar cell comprises the following components by weight: 100 parts of polyester resin and 20 parts of melamine formaldehyde resin.

[0037] The preparation method of the melamine formaldehyde resin is as follows: add melamine to the formaldehyde aqueous solution with a pH value of 8-8.5, heat up to 70°C and keep it warm, and continue the heat preservation reaction for half an hour after the system is clarified, then cool down to 40°C, and add methanol , and then adjust the pH value to 5-6, raise the temperature to 50° C. for 1 hour, and adjust the pH value to 8-9 again to obtain the desired melamine formaldehyde resin. The molar ratio of the melamine to formaldehyde is 1:6, and the molar ratio of the melamine to methanol is 1:20.

[0038] Wherein the polyester resin is a polycarboxylic acid and a polyhydric alcohol copolymer, and the polycarboxylic acid contains 90 mol% of a mixture of phthalic acid, terephthalic a...

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Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a water-resistant polyester resin adhesive for solar cell back surface protection films, and applications thereof, wherein the water-resistant polyester resin adhesive comprises, by weight, 100 parts of a polyester resin and 5-30 parts of a melamine formaldehyde resin, and the gelation rate of the adhesive is more than 50%. According to the present invention, the solar cell back surface protection film is formed by carrying out compound pressing on an electrical insulating layer, a moisture-resistant layer,a weathering-resistant layer and an adhesion layer, wherein the adhesion layer at least comprises the adhesive for the for solar cell back surface protection film; and with the technical scheme, the chelating system formed by adding the specific melamine formaldehyde resin can block the polar groups such as carboxyl, hydroxyl and the like on the branched chain so as to substantially reduce the viscosity of the system and substantially improve the hydrolysis resistance, such that the excellent processing construction performance is provided, the interlayer peel strength is high, and the servicelife is substantially prolonged.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and in particular relates to a water-resistant polyester resin adhesive used for a protective film on the back of a solar cell and its application. Background technique [0002] Solar cells have attracted much attention as a renewable clean energy. One or several semiconductors that can directly convert the energy of sunlight into electrical energy can form a solar cell unit. Several or even dozens of the above-mentioned solar cell units are connected in series or in parallel with wires and then sealed with resin, especially for protection. The solar cell units that need to work for a long time are packaged with various suitable materials to make components, namely solar cell modules. In general, the sun-irradiated surface is covered with a glass plate or a transparent plastic film, and a thermoplastic resin is used as a filling material to embed the gap, while the back is protected with a pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J167/02C09J161/28C09J7/30H01L31/049C08G12/32
CPCC08G12/32C08L2203/204C09J167/02C09J2203/322C09J2301/16C09J2467/00H01L31/049C08L61/28Y02E10/50
Inventor 唐超李华
Owner SUZHOU GOLDEN TECH MATERIAL
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