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Transparent backboard for packaging solar cell

A solar cell and transparent technology, applied in the field of solar cells, can solve the problems of low transmittance of UV-resistant PET, inability to effectively improve the transmittance of the back sheet, delamination failure, etc., and achieve excellent UV resistance and heat and humidity resistance, Effective long-term UV shielding effect

Pending Publication Date: 2020-09-22
乐凯胶片股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Chinese patent document CN104201224A, nano-scale fillers are used in the transparent coating formula to adjust light transmittance and haze, but nano-sized particles are easy to agglomerate and difficult to disperse evenly, which is likely to cause the disadvantages of the transparent coating, and there is a risk of delamination failure.
Chinese patent document CN110157319A uses a silicon compound prepared by silicate and a silane coupling agent under acid catalysis to increase the hardness of the coating film. The silicon compound obtained by this method has low porosity and cannot effectively improve the light transmittance of the backplane.
Due to the light transmittance of UV-resistant PET is lower than 90%

Method used

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  • Transparent backboard for packaging solar cell
  • Transparent backboard for packaging solar cell
  • Transparent backboard for packaging solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Coating liquid formula: take fluorocarbon resin (GK-570) 30g, acrylic resin (Haina HN-2604) 10g, butyl acetate 55g, nano-scale filler TiO 2 (Meililian RCL69) 0.9g, fumed silica (OK607) 2.4g, dispersant (BYK2155) 0.024g, UV absorber (UV-384) 1.5g, light stabilizer (Chimassorb 944) 0.5g, anti-hydrolysis agent (Stabaxol I type) 0.5 g, high shear dispersion to obtain a coating liquid A part, add 4.2 g of isocyanate (N3390), stir evenly to obtain a transparent coating liquid.

[0031] The manufacturing method of the back plate: apply 30% transparent adhesive layer coating solution on one side of the PET, and dry it at 140°C for 2 minutes; the adhesive thickness is 10 μm; the other side of the PET is compounded with a transparent PVF with a dry thickness of 25 μm , the samples were tested for performance after being aged at 50°C for 3 days.

Embodiment 2

[0033] Coating liquid formula: take 36g of fluorocarbon resin (Changxing 41011), 4g of acrylic resin (Jiangsu Sanmu 962), 50g of butyl acetate, nano-scale filler TiO 2 (Meililian RCL69) 0.1g, fumed silica (OK520) 1.2g, dispersant (BYK2155) 0.048g, UV absorber (UV-1577) 1.92g, light stabilizer (Chimassorb 944) 1.2g, anti-hydrolysis agent (Stabaxol I type) 0.5 g, high shear dispersion to obtain the coating liquid A part, add isocyanate (N3370) 10.18 g, stir evenly to obtain a transparent coating liquid.

[0034] The manufacturing method of the back plate: apply 25% transparent adhesive layer coating solution on one side of the PET, and dry it at 140°C for 2 minutes; the bonding thickness is 5 μm; the other side of the PET is compounded with transparent PVDF with a dry thickness of 25 μm , the samples were tested for performance after being aged at 50°C for 3 days.

Embodiment 3

[0036] Coating liquid formula: take 20g of fluorocarbon resin (Changxing 41011), 20g of acrylic resin (Changxing 73331-S-60), 25g of butyl acetate, nano-scale filler TiO 2(Meililian RCL69) 2.4g, fumed silica (ACEMATT 3600) 0.48g, dispersant (BYK2155) 0.072g, ultraviolet absorber (UV-400) 0.48g, light stabilizer (Chimassorb 944) 0.14g, anti-hydrolysis 0.5 g of the agent (Stabaxol I type) was dispersed with high shear to obtain the coating liquid A part, 6.5 g of isocyanate (N3790) was added, and the mixture was evenly stirred to obtain a transparent coating liquid.

[0037] The production method of the back plate: apply 40% transparent adhesive layer coating solution on one side of the PET, and dry it at 140 ° C for 2 minutes; the adhesive thickness is 20 μm; the other side of the PET is compounded with a transparent coating with a dry thickness of 25 μm. layer (formulation of adhesive layer coating liquid formulation), and the performance of the sample was tested after aging a...

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Abstract

The utility model discloses a transparent backboard for packaging a solar cell. The backboard comprises a transparent bonding layer, a base material layer, an adhesive layer and a weather-proof layer,wherein the transparent bonding layer is formed by coating and curing a coating solution prepared from weather-proof resin and isocyanate; the coating liquid comprises a component A and a component B; the component A comprises, by mass, 50 to 83 parts of weather-resistant resin, 0.5 to 3 parts of a modified nanoscale filler, 1-3 parts of a rough surface agent, 0.05 to 0.1 part of a dispersing agent, 0.9 to 2.5 parts of an ultraviolet absorbent, 0.3-1.5 parts of a light stabilizer, 0.3-1 part of a leveling agent and 20-50 parts of a solvent; the component B is isocyanate; the weather-resistantresin is formed by blending fluorocarbon resin and acrylic resin according to the ratio of (1-8):1, and the equivalent ratio of NCO to OH of isocyanate to weather-resistant resin is (0.6-1.2):1. Thebackboard provided by the invention has the properties of high light transmittance, low haze, high hardness, stain resistance and scratch resistance, and also has excellent ultraviolet resistance andhumidity and heat resistance.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a back sheet for encapsulating solar cells. Background technique [0002] The solar cell module is a layered structure of multi-layer materials, from the surface contacting the sun down, it is a glass front plate, a first EVA encapsulation layer, a power generation silicon wafer, a second EVA encapsulation layer and a thin film back plate or glass. With the maturity of bifacial cell technology, bifacial power generation modules have attracted much attention. The traditional double-sided power generation modules are double-glass modules, and the application of double-sided battery technology is restricted due to fragility, excessive weight and difficult installation. The polymer transparent backsheet, due to its excellent flexibility and strength, high light transmittance, light weight, and simple installation and operation and maintenance, maximizes the use of existing equip...

Claims

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Application Information

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IPC IPC(8): C09J7/29C09J127/12C09J133/04C09J11/04C09J11/06H01L31/048H01L31/049
CPCC09J7/29C09J127/12C09J11/04C09J11/06H01L31/0481H01L31/049C09J2203/33C09J2467/006C09J2427/006C08K2003/2241C08K2003/2296C08K2003/2213C08K2201/011C08K2201/003C08L2201/08C08L33/04C08K13/06C08K9/06C08K7/26C08K3/22C08K5/005Y02E10/50
Inventor 刘芳梁宏陆杨辉胡亚召李华锋
Owner 乐凯胶片股份有限公司
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