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Polyvinylidene fluoride (PVDF) thin film for single-sided frosted and high-reflection solar backplate and preparation method of PVDF thin film

A technology of solar backsheet and high reflection, which is applied in the field of optical film, can solve the problem that the solar backsheet cannot take into account EVA adhesive force and high reflectivity, etc., and achieve the effect of strong adhesive force, stable performance, and improved utilization

Active Publication Date: 2016-08-24
SUZHOU GOLDEN TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a PVDF film for a single-sided frosted high-reflection solar backsheet and its preparation method, which is used to solve the problem that the current solar backsheet cannot take into account both EVA adhesion and high reflectivity

Method used

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  • Polyvinylidene fluoride (PVDF) thin film for single-sided frosted and high-reflection solar backplate and preparation method of PVDF thin film
  • Polyvinylidene fluoride (PVDF) thin film for single-sided frosted and high-reflection solar backplate and preparation method of PVDF thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 Preparation of acrylic acid grafted polyvinylidene fluoride copolymer PVDF-g-P (AA)

[0025] Add 40mL DMF to the four-neck flask, dissolve 2g PVDF powder in the DMF solution, heat, blow nitrogen for 30min to remove air, add acrylic acid AA (mass fraction is 10%), heat in a water bath at 70°C, after 30min, add trigger Agent BPO 0.1g, reacted for 5h, after the reaction was finished, cooled at room temperature, precipitated with 50mL of absolute ethanol to remove acrylic acid homopolymer and impurities, and then vacuum dried for 24h to obtain PVDF-g-P (AA), grafting rate = (Amount of polymer after grafting-Amount of polymer before grafting) / Amount of polymer before grafting=0.8%.

Embodiment 2

[0027] The outer layer is a frosted polyvinylidene fluoride film, and the components of the outer layer raw materials are: 1 part by weight of titanium dioxide (particle size 20 μm), 1 part by weight of silicon dioxide and 50 parts by weight of polyvinylidene fluoride resin melted blend.

[0028] The middle layer is a polymethyl methacrylate film, and the specific configuration method can refer to the existing PMMA film forming method.

[0029] The inner layer is a polyvinylidene fluoride film, and each component of the inner layer raw material is: 1 weight part of titanium dioxide (particle size: 20 μm) and 50 weight parts of polyvinylidene fluoride resin melted and blended.

[0030] The reflective layer is an acrylic modified polyvinylidene fluoride film, and each component of the reflective layer raw material is: 1 weight part of titanium dioxide (20 μm in particle size) and 50 weight parts of PVDF-g-P (AA) prepared in Example 1. blend.

[0031] Such as figure 1 As shown...

Embodiment 3

[0038] The outer layer is a frosted surface polyvinylidene fluoride film, and the components of the outer layer raw materials are: 5 parts by weight of titanium dioxide (particle size 50 μm), 5 parts by weight of silicon dioxide and 50 parts by weight of polyvinylidene fluoride resin melt blend.

[0039] The middle layer is a polymethyl methacrylate film, and the specific configuration method can refer to the existing PMMA film forming method.

[0040] The inner layer is a polyvinylidene fluoride film, and each component of the inner layer raw material is: 5 parts by weight of titanium dioxide (particle size: 50 μm) and 50 parts by weight of polyvinylidene fluoride resin are melt blended.

[0041] The reflective layer is an acrylic modified polyvinylidene fluoride film, and each component of the reflective layer raw material is: 5 parts by weight of titanium dioxide (50 μm in particle size) and 50 parts by weight of PVDF-g-P (AA) prepared in Example 1. blend.

[0042] Such a...

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Abstract

The invention belongs to the technical field of an optical film, in particular relates to a polyvinylidene fluoride (PVDF) thin film for a single-sided frosted and high-reflection solar backplate and a preparation method of the PVDF thin film. The PVDF thin film comprises an outer layer, an intermediate layer, an inner layer and a light reflection layer which are formed by melting extrusion and are sequentially combined from one side to the other side, the materials of the outer layer and the inner layer are polyvinylidene fluoride, one surface, far away from the intermediate layer, of the outer layer is a frosted surface, and the material of the light reflection layer is a crylic acid grafted polyvinylidene fluoride copolymer. The preparation method comprises the following steps of allowing the raw materials of the outer layer, the intermediate layer, the inner layer and the light reflection layer thin film to sequentially pass through an extruding machine, a multi-layer co-extrusion machine head, a cooling roller and a traction winding mechanism for combination and formation, wherein the cooling roller comprises a polishing roller and an embossing roller. In the technical scheme provided by the invention, the PVDF film layer is modified by introducing crylic acid graft, the problem of EVA bonding is solved, the reflective rate of a surface, close to EVA, of a backlight film is also improved, and the light utilization degree is improved.

Description

technical field [0001] The invention belongs to the technical field of optical films, and in particular relates to a PVDF film for a single-side frosted high-reflection solar backboard and a preparation method thereof. Background technique [0002] The solar cell panel is mainly composed of a front plate, a solar cell and a back plate. The front plate is tempered glass with high light transmittance, and the solar cell is encapsulated by EVA (polyethylene-polyvinyl acetate copolymer) film. The solar backsheet is located on the back of the solar panel, which protects and supports the battery sheet, and needs to have reliable insulation, water resistance, and aging resistance. The solar backsheet generally has a three-layer structure. The outer protective layer needs to have good environmental erosion resistance and better bonding performance with the inner layer. Because the weather resistance of the fluorine-containing film is outstanding, the outer protective layer is genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/049H01L31/18B32B27/30B32B27/08
CPCB32B27/08B32B27/308B32B2307/416H01L31/049H01L31/18Y02E10/50Y02P70/50
Inventor 唐超李华
Owner SUZHOU GOLDEN TECH MATERIAL
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