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Back plate film of solar cell

A solar cell and backplane film technology, which is applied in the direction of circuits, photovoltaic power generation, electrical components, etc., can solve the problem of unstable bonding performance between fluoroplastics and EVA film, attenuation of bonding performance between backplane film and EVA film, and the effect of Unsatisfactory problems, etc., to achieve the effect of long service life, simple and easy operation, and guaranteed adhesion

Inactive Publication Date: 2012-04-18
FSPG HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, looking at the existing modification methods, either the process is complicated and the cost is high; or the process is relatively simple, but the effect is not ideal. The adhesive performance of the plate film and the EVA film is gradually attenuated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Scrub the polyvinylidene fluoride (PVDF) film with acetone and dry it in an oven at 60°C to constant weight;

[0030] Preparation concentration is 30% acrylic acid aqueous solution, the concentration of copper sulfate is 0.005mol / L, the mass concentration of hydrochloric acid is 0.08mol / L;

[0031] Weigh a certain amount of PVDF membrane, soak the membrane in the prepared monomer solution, it is advisable to completely immerse the membrane in the monomer solution. Make the PVDF membrane and the monomer solution pass through the electron accelerator at a constant speed, and the irradiation dose is 50kGy.

[0032] After irradiation, the liquid phase was removed, the polyvinylidene fluoride membrane was rinsed repeatedly with water, and soaked in a water bath at 70°C for 24 hours to remove homopolymers and unreacted monomers, and then the membrane was dried to constant weight.

[0033] The grafting rate was measured to be 3.7% by weighing method.

[0034] The grafted flu...

Embodiment 2

[0037] The experimental method is the same as in Example 1, except that the prepared acrylic acid solution is a 10% acrylamide solution, and the solvent is water and ethanol (volume ratio is 1:1); the concentration of copper sulfate is 0.0005mol / L, Without adding inorganic acid, the irradiation dose is 46 kGy. All the other steps are the same as in Example 1.

[0038] The graft rate of the fluoroplastic film as the weather-resistant film of the inner and outer layers was measured by weighing method to be 0.4%. The obtained solar battery back sheet film is tested according to GB / T2790-1995, and the peel strength measured with the EVA adhesive film is 51.1 N / cm.

Embodiment 3

[0040] It differs from Implementation 1 in that the fluoroplastic is polyvinyl fluoride, and the dried polyvinyl fluoride film is first irradiated with 80 kGy, and then mixed with 20% acrylic acid aqueous solution (containing 0.05mol / L sulfuric acid) at 70 ℃ water bath reaction 4h. All the other experimental steps are the same as in Example 1.

[0041] The obtained polyvinyl fluoride film has a grafting rate of 6.9% as measured by weighing method.

[0042] The grafted fluoroplastic film is used as the inner and outer weather-resistant film and the moisture-resistant film of polyethylene terephthalate (PET) in the middle layer is combined through an adhesive by a dry compounding process. Among them, the thickness of the inner and outer weather-resistant films is 100um, the thickness of the moisture barrier film is 200um, and the thickness of the adhesive layer is 30um. The prepared backsheet film and EVA adhesive film were hot-pressed at 137°C.

[0043] The obtained solar ba...

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Abstract

The invention discloses a back plate film of a solar cell. The back plate film comprises fluoroplastic films on the inner and outer layers adhered by an adhesive and a moisture resisting film on a middle layer, wherein the fluoroplastic films are grafted with acrylate substances. The fluoroplastic films are grafted with acrylate substances through irradiation, and the grafting chain is connected with the fluoroplastic through a chemical bond, being relatively stable and not weakening with the time lasting; and therefore, the sticking property between the prepared back plate film of the solar cell and an EVA (ethylene vinyl acetute) adhesive film as well as the stability of the back plate film is ensured, and the service life of the prepared back plate of the solar cell is long.

Description

technical field [0001] The invention relates to a protective and supporting film on the back of a solar cell, in particular to a back sheet film of a solar cell; the invention also relates to a method for preparing a fluoroplastic film grafted with acrylic substances in the back sheet film of a solar cell. Background technique [0002] The solar cell backsheet film is located on the back of the solar cell panel, which protects and supports the cells, and needs to have reliable insulation, water resistance, and aging resistance; it usually consists of an inner and outer weather-resistant layer and a middle moisture-resistant layer. composition. [0003] At present, the commonly used solar cell backsheet films mainly include TPT, TPE, all-PET and PET / polyolefin structures. Among them: T refers to the polyvinyl fluoride (PVF) film of DuPont in the United States; P refers to the biaxially stretched polyethylene terephthalate film, that is, PET film, also known as polyester fil...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B7/12H01L31/048H01L31/049
CPCY02E10/50
Inventor 李永鸿谢映雪谭健
Owner FSPG HI TECH
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