A kind of pvdc emulsion and its solar cell backboard

A technology of solar cells and emulsions, applied in circuits, photovoltaic power generation, electrical components, etc., can solve the problems of difficulty in ensuring the adhesion fastness of the support layer, affecting the quality of film formation, and difficult volatilization of solvents, etc., so as to reduce the water vapor transmission rate and interface Improvement of bonding fastness and improvement of heat resistance

Active Publication Date: 2021-04-09
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

[0005] The existing methods for improving the barrier properties of coated backsheets mainly include: Chinese patent CN105619980A discloses a coated high-insulation and moisture-resistant backsheet, which uses PET as the support layer and coats polyethylene blends as the insulating layer. Coating acrylamide and vinyl alcohol copolymer as a moisture barrier layer to obtain a high-insulation and moisture-resistant backsheet, this kind of backsheet requires a thicker coating to ensure barrier properties, which will cause the solvent in the coating to be difficult to volatilize and affect the film quality , ultimately affecting product performance
Chinese patent CN108164731A discloses a preparation method of a barrier coating solution without primer, using PVDC latex to add PVOH, which solves the adhesion to the substrate, but the addition of PVOH will greatly reduce the barrier property under high humidity conditions ; Chinese patent CN108410280A discloses a preparation of PVDC emulsion for coating, and its comonomer is one or more of acrylic monomers such as methyl acrylate and ethyl acrylate. The addition amount is 4%-16%, it is difficult to guarantee the adhesion fastness with the support layer

Method used

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  • A kind of pvdc emulsion and its solar cell backboard
  • A kind of pvdc emulsion and its solar cell backboard
  • A kind of pvdc emulsion and its solar cell backboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of modified PVDC emulsion 1: Weigh 100g of vinylidene chloride monomer, 28.6g of glycidyl methacrylate monomer, 4g of sodium dodecylsulfonate, 0.4g of initiator ammonium persulfate, and 70g of deionized water , adjust the pH of the emulsion to 6, in the pass N 2 Under the conditions, the temperature was raised to 50° C., stirred for 10 h, cooled and discharged, and modified PVDC emulsion 1 was obtained.

[0038] The substrate layer uses semi-permeable PET with a thickness of 250 μm.

[0039] Production of the backsheet: Coat one side of the PET with 65% modified PVDC emulsion 1, and dry at 90°C for 2 minutes; obtain a barrier layer with a thickness of 6 μm; coat a second weather-resistant layer with a dry thickness of 3 μm on the barrier layer. The other side of the PET was coated with the first weather-resistant layer with a dry thickness of 20 μm, and the performance of the sample was tested after aging at 50°C for 3 days.

Embodiment 2

[0041] Preparation of modified PVDC emulsion 2: Weigh 46 g of vinylidene chloride monomer, 13 g of glycidyl acrylate monomer, 2 g of sodium lauryl sulfate, 0.4 g of initiator potassium persulfate, and 140 g of deionized water to adjust the pH of the emulsion for 6, in thru N 2 Under the conditions, the temperature was raised to 50° C., stirred for 10 h, cooled and discharged, and modified PVDC emulsion 2 was obtained.

[0042] The substrate layer uses semi-permeable PET with a thickness of 220 μm.

[0043] Production of the backsheet: Coat one side of the PET with 30% modified PVDC emulsion 2, and dry at 90°C for 2 minutes; obtain a barrier layer with a thickness of 1 μm; coat a second weather-resistant layer with a dry thickness of 10 μm on the barrier layer. The other side of the PET was coated with the first weather-resistant layer with a dry thickness of 16 μm, and the performance of the sample was tested after aging at 50°C for 3 days.

Embodiment 3

[0045] Preparation of modified PVDC emulsion 3: Weigh 79g of vinylidene chloride monomer, 31g of allyl glycidyl ether monomer, 2g of sodium lauryl sulfate, 0.6g of initiator potassium persulfate, 90g of deionized water, adjust The pH of the emulsion is 6, in the pass N 2 Under the conditions, the temperature was raised to 50° C., stirred for 10 h, cooled and discharged, and modified PVDC emulsion 3 was obtained.

[0046] The substrate layer uses semi-permeable PET with a thickness of 180 μm.

[0047] The production method of the back sheet: apply 55% modified PVDC emulsion 3 on one side of the PET, and dry at 90°C for 2 minutes; obtain a barrier layer with a thickness of 20 μm; coat a second weather-resistant layer with a dry thickness of 20 μm on the barrier layer, The first weather-resistant layer with a dry thickness of 30 μm was coated on the other side of the PET, and the performance of the sample was tested after aging at 50°C for 3 days.

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Abstract

A PVDC emulsion, made of the following components by weight: 23-50 parts of vinylidene chloride monomer, 7-23 parts of modified monomer, 0.2-0.5 part of initiator, 1-2 parts of emulsifier, Dispersant 33.8-67.5, PH regulator 0.001-0.02 parts. The present invention improves the heat resistance and adhesiveness of PVDC by selecting comonomers with specific functional groups, so that PVDC can be used as the barrier layer of the coating-type back sheet, which can not only improve the water vapor barrier property of the back sheet, but also add fluorine to the barrier layer. The carbon coating guarantees the weather resistance of the solar cell backsheet.

Description

technical field [0001] The invention relates to a thin film, especially an emulsion used for PVDC coating and a solar battery back plate prepared therefrom. Background technique [0002] PVDC, whose scientific name is "polyvinylidene chloride", is a thermoplastic polymer with a softening temperature of 160-200°C. It has a linear polymer chain structure connected head to tail. Its molecular chain structure is regular and its crystallinity is high. Its excellent high barrier properties, toughness and flame retardancy make it a polymer material with multiple uses, and it is widely used in various industries. As a packaging material, thanks to its unparalleled barrier properties, oil immersion resistance, acid and alkali resistance, chemical corrosion resistance and excellent printing and heat sealing performance, it has been leading and leading in the packaging industry for decades. status. [0003] The crystallinity of PVDC itself can generally reach more than 80%. Due to it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/08C08F220/32C08F216/14C09D127/16C08J7/043H01L31/048H01L31/049C08L67/02
CPCC08F214/08C08J2367/02C08J2427/16C09D127/16H01L31/0481H01L31/049C08F216/1416Y02E10/50
Inventor 刘芳王琨杨辉
Owner 乐凯胶片股份有限公司
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