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Vinylidene fluoride copolymer used as solar back panel film and preparation method of vinylidene fluoride copolymer

A technology of solar backplane film and vinylidene fluoride, which is applied in photovoltaic power generation, electrical components, circuits, etc., can solve problems such as unsuitable solar backplane film, easy aggregation of polymer particles, and product sticking phenomenon, and achieve energy consumption Less, high product purity, the effect of destroying regularity

Active Publication Date: 2012-07-18
ZHEJIANG FLUORINE CHEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But another problem that cannot be ignored is: the rigidity of PVDF resin is too strong, the flexibility is insufficient, and it is difficult to form. Generally, acrylic materials need to be added. This material will cause local aging, cracking, and poor adhesion to EVA.
Using this method, the polymer particles are easy to agglomerate, and the product sticks to the kettle seriously.
[0012] Chinese patent CN101072801B discloses a method for preparing PVDF by suspension. The polymer produced by this method has high purity and excellent high-temperature color resistance, but its toughness is insufficient, so it is not suitable for preparing solar backplane film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 5600g of deionized water to a 10L stainless steel vertical reaction kettle, purging with nitrogen and stirring for 40min, so that the oxygen content in the kettle is lower than 30ppm. 30 g of hexafluoropropylene was introduced into the reaction kettle, the stirring speed was adjusted to 180 r / min, and the temperature was raised to 44°C. Add 40g of hydroxypropyl methylcellulose, 5g of magnesium hydroxide, and 8g of ethyl acetate into the reaction kettle, feed vinylidene fluoride to raise the pressure in the kettle to 4.0MPa, and inject 30g of dihydrogen peroxide into the reaction kettle through a compression pump. Diisopropyl carbonate initiates the reaction. When the pressure in the reactor dropped to 3.5MPa, the temperature of the reactor was raised to 65°C at a rate of 10°C / h, and at the same time, the pressure in the reactor was maintained at 6.8MPa by adding vinylidene fluoride monomer. Inject 10g, 8g, 7g, and 14g of diisopropyl peroxydicarbonate into the react...

Embodiment 2

[0045] Add 5600g of deionized water to a 10L stainless steel vertical reaction kettle, purging with nitrogen and stirring for 40min, so that the oxygen content in the kettle is lower than 30ppm. 40 g of hexafluoropropylene was introduced into the reaction kettle, the stirring speed was adjusted to 180 r / min, and the temperature was raised to 44°C. Add 70g of hydroxypropyl methylcellulose, 3.0g of magnesium hydroxide, and 10g of ethyl acetate to the reactor, feed vinylidene fluoride to raise the pressure in the reactor to 4.0MPa, and inject 50g of peroxide into the reactor through a compression pump. Diisopropyl dicarbonate initiates the reaction. When the pressure in the reactor dropped to 3.5MPa, the temperature of the reactor was raised to 65°C at a rate of 10°C / h, and at the same time, the pressure in the reactor was maintained at 7.0MPa by adding vinylidene fluoride monomer. Inject 9g, 8g, 7g, and 15g of diisopropyl peroxydicarbonate into the reactor for a total of 4 time...

Embodiment 3

[0047] Add 5600g of deionized water to a 10L stainless steel vertical reaction kettle, purging with nitrogen and stirring for 40min, so that the oxygen content in the kettle is lower than 30ppm. 35 g of hexafluoropropylene was introduced into the reaction kettle, the stirring speed was adjusted to 180 r / min, and the temperature was raised to 44°C. Add 28g of hydroxypropyl methylcellulose, 25g of magnesium hydroxide, and 8g of ethyl acetate into the reaction kettle, feed vinylidene fluoride to raise the pressure in the kettle to 4.0MPa, and inject 20g of dihydrogen peroxide into the reaction kettle through a compression pump. Diisopropyl carbonate initiates the reaction. When the pressure in the reactor dropped to 3.5MPa, the temperature of the reactor was raised to 65°C at a rate of 10°C / h, and at the same time, the pressure in the reactor was maintained at 6.0MPa by adding vinylidene fluoride monomer. Inject 12g, 10g, 8g, and 14g of diisopropyl peroxydicarbonate into the rea...

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Abstract

The invention discloses a vinylidene fluoride copolymer used as a solar back panel film and a preparation method of the vinylidene fluoride copolymer, belonging to the technical field of solar battery manufacturing in a solar photovoltaic industry. The vinylidene fluoride copolymer is characterized by being formed by polymerizing vinylidene fluoride with a vinylidene difluoride monomer, wherein the vinylidene difluoride monomer is one or more of tetrafluoroethylene, perfluorinated alkylvinylether, vinyl fluoride, chlorotrifluoroethylene and hexafluoropropylene. According to the invention, the vinylidene fluoride copolymer used as the solar back panel film is prepared by adopting a suspension copolymerization technology, namely, the copolymer is formed by introducing a proper amount of vinylidene difluoride monomers in the VDF (vinylidene fluoride) polymerization process, thus the regularity of a PVDF (polyvinylidene fluoride) molecular chain structure can be effectively regulated, crystallinity is reduced, and the bonding property of the vinylidene fluoride copolymer and EVA (ethylene-vinyl acetate) is increased, so as to meet the use requirement of the solar back panel film.

Description

technical field [0001] The invention belongs to the technical field of solar cell manufacturing in the solar photovoltaic industry, in particular to a vinylidene fluoride copolymer used as a solar back plate film and a preparation method thereof. Background technique [0002] With the development of the solar photovoltaic industry, various related components have attracted more and more attention from the industry. In solar cell modules, the backsheet is mainly TPT and TPE structure, where T refers to the polyvinyl fluoride (PVF) film of DuPont Company of the United States, whose trade name is Tedlar, which is made by casting method; P refers to polyethylene terephthalate Glycol ester film, that is, PET film; E refers to ethylene-vinyl acetate resin, that is, EVA, which is usually used as an adhesive between the back sheet and the battery and between the layers of the back sheet. [0003] The main function of the solar backsheet is to protect the internal cells, which requi...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/26C08F216/14C08F214/20C08F214/18C08F214/28C08F2/18H01L31/048H01L31/049
CPCY02E10/50
Inventor 苗国祥王姓传李晓育陈炜
Owner ZHEJIANG FLUORINE CHEM NEW MATERIAL
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