PVDF (polyvinylidene fluoride) film modified with nano-titanium dioxide and preparation method for PVDA film

A nano-titanium dioxide, titanium dioxide technology, applied in the field of functional film and its preparation, can solve the problems of poor bonding performance, poor dispersion effect, material mechanical properties decline, etc., and achieve the goal of reducing pollution, simple preparation method and high grafting rate Effect

Active Publication Date: 2012-12-12
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in the prior art, the bonding performance between the back film and the back plate base material is relatively poor, when the PVDF film is modified with titanium dioxide, the titanium dioxide is prone to agglomeration, and in the PVDF matrix Poor dispersion effect will reduce the mechanical properties of the material

Method used

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  • PVDF (polyvinylidene fluoride) film modified with nano-titanium dioxide and preparation method for PVDA film
  • PVDF (polyvinylidene fluoride) film modified with nano-titanium dioxide and preparation method for PVDA film

Examples

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Embodiment 1

[0025] Nano-TiO 2 The preparation method of surface-grafted polyfluorine-containing acrylate, specifically: in the reaction kettle, sequentially add 10 parts of dried nano-TiO 2 (particle size 1um), 100 parts of xylene and 5 parts of γ-aminopropyltriethoxysilane, mechanically stirred for 8 hours. After the reaction, filter, wash with absolute ethanol, and dry in vacuum. Weigh 8 parts of nano-TiO treated with silane 2 Put it in the reaction kettle, add 100 parts of distilled water and 5 parts of 0.5mol / L sodium hydroxide solution in sequence, slowly raise the temperature to 70°C with mechanical stirring, and blow in nitrogen to remove the air in the reaction kettle (the time is about 30min), Add 0.25 parts of ammonium persulfate, and slowly drop 50 parts of dodecafluoroheptyl methacrylate (drip within 30 minutes), and react for 2 hours. Add the remaining 0.25 parts of ammonium persulfate and continue the reaction for 8 hours. After the reaction, the product is vacuum filtere...

Embodiment 2

[0034] Nano-TiO 2 The preparation method of surface-grafted polyfluorine-containing acrylate, specifically: in the reaction kettle, sequentially add 10 parts of dried nano-TiO 2 (Particle size is 5um), 100 parts of xylene and 10 parts of γ-aminopropyltriethoxysilane, mechanically stirred for 9 hours. After the reaction, filter, wash with absolute ethanol, and dry in vacuum. Weigh 8 parts of nano-TiO treated with silane 2Put it in the reaction kettle, add 100 parts of distilled water and 5 parts of 0.5mol / L sodium hydroxide solution in sequence, slowly raise the temperature to 70°C with mechanical stirring, and blow in nitrogen to remove the air in the reaction kettle (the time is about 30min), Add 0.5 parts of ammonium persulfate, and slowly add 75 parts of dodecafluoroheptyl acrylate dropwise (dropping within 45 minutes), and react for 2 hours. Add the remaining 0.5 parts of ammonium persulfate and continue the reaction for 8 hours. After the reaction, the product is vacuu...

Embodiment 3

[0042] Nano-TiO 2 The preparation method of surface-grafted polyfluorine-containing acrylate, specifically: in the reaction kettle, sequentially add 7.5 parts of dried nano-TiO 2 (particle size is 2.5um), 100 parts of xylene and 10 parts of γ-aminopropyltriethoxysilane, mechanically stirred for 9 hours. After the reaction, filter, wash with absolute ethanol, and dry in vacuum. Weigh 8 parts of nano-TiO treated with silane 2 Put it in the reaction kettle, add 100 parts of distilled water and 5 parts of 0.5mol / L sodium hydroxide solution in sequence, slowly raise the temperature to 70°C with mechanical stirring, and blow in nitrogen to remove the air in the reaction kettle (the time is about 30min), Add 0.35 parts of ammonium persulfate, and slowly drop 50 parts of hexafluorobutyl acrylate and 50 parts of hexafluorobutyl methacrylate (drip within 60 minutes), and react for 2 hours. Add the remaining 0.35 parts of ammonium persulfate and continue the reaction for 8 hours. Afte...

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Abstract

The invention provides a PVDF (polyvinylidene fluoride) film modified with nano-titanium dioxide and a preparation method for the PVDA film. Fluorinated polyacrylate is grafted on the surface of the nano-titanium dioxide in the film, compatibility of TiO2 in PVDF is greatly improved due to the existence of a graft monomer, and when the PVDF film is used for solar cell back films, bonding force between the PVDF film and other dorsal plate base materials is greatly enhanced. The preparation method includes: firstly grating the fluorinated polyacrylate on the surface of TiO2, weighing graft copolymer and the PVDF according to a part ratio for mixing in a mechanical stirring manner, using an extruder for extrusion and strip formation after uniformly mixed, placing into a drying oven to dry moisture after being cut into granules, squeezing out by a single screw for tape casting, and obtaining the modified PVDF film.

Description

technical field [0001] The invention relates to a functional thin film and a preparation method thereof, in particular to a thin film material which can be used for a back film of a solar cell and a preparation method thereof. Background technique [0002] The fluorine element in the fluorine material on the surface of the fluorine-containing back film has a large electronegativity, a small van der Waals radius, and a strong carbon-fluorine bond energy, and the spiral rod-shaped molecules in the unique fluorinated chain overall structure are compact, rigid, and smooth. The performance of fluororesin such as weather resistance, heat resistance, low temperature resistance and chemical resistance is very superior. The above-mentioned excellent properties make the reliability of long-term outdoor use improved when the fluorine-containing material is used as a back film that acts as a barrier to the external environment and the interior of the solar cell. PVDF is a semi-crystall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L51/10C08F292/00
Inventor 陶国良夏艳平戴宏程
Owner CHANGZHOU UNIV
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