Polyimide film for thin-film solar cell and preparation method thereof

Abstract

The invention provides a polyimide film for a thin-film solar cell and a preparation method thereof. The polyimide film comprises, by weight, 100 parts of polyimide resin and 0.0001-0.1 part of nanometer aluminum powder. Screw-type blending and extrusion equipment is used for blending the polyimide resin and the nanometer aluminum powder, the mixture is extruded, filtered and led into a cast die head, and then the processes such as cooling, drafting and rolling are conducted on the mixture to obtain the polyimide film for the thin-film solar cell. The product prepared through the method is attached to the light receiving surface of the thin-film solar cell or used as an upper packaging film of the solar cell, and therefore the generating efficiency of flexible or thin-film solar cells is increased directly.

Description

technical field

[0001] The invention relates to a polyimide film for a thin-film solar cell and a preparation method thereof. The efficiency of the flexible or thin-film solar cell is directly improved by using the film to encapsulate the light-incident surface of the flexible or thin-film solar cell. Background technique

[0002] Organic polymer materials such as polymethyl methacrylate (PMMA), polystyrene (PS) and polycarbonate (PC) have excellent light transparency in the visible wavelength range, so these materials are often used as optical instrument. However, the temperature resistance of general-purpose polymer materials is often not enough, which limits their use in high-temperature environments. High temperature-resistant transparent materials refer to transparent materials that can withstand processing above 250 °C. They are mainly used for flexible solar cell backplanes, ITO backplanes for liquid crystal displays to replace fragile glass, alignment films for liqu...

Examples

Embodiment 1

[0017] Example 1: 100 kg of polyimide resin (Ningbo Jinshan Electronic Materials Co., Ltd.) and 0.02 kg of nano-aluminum powder were mixed evenly with a stirrer at a temperature of 10°C; the above blend was introduced into a screw mixing extruder for Blending extrusion, the temperature is controlled at 285°C, the extrudate is filtered through a 180-mesh filter, metered extrusion (the pressure difference between the inlet and outlet of the metering pump is 2MPa), the cast film thickness is 50UM, 10°C air cooling, 4 times the draft ratio Stretching, release paper coating, winding and other processes to obtain polyimide film for flexible or thin film solar cells. The performance of the thin-film solar cell using the thin film is 3.6% higher than that of the unused thin-film solar cell.

Embodiment 2

[0018] Example 2: Mix 100 kg of polyimide resin (Ningbo Jinshan Electronic Materials Co., Ltd.) and 0.0001 kg of nano-aluminum powder with a stirrer at a temperature of -10°C; import the above blend into a screw mixing extruder Perform blending and extrusion, the temperature is controlled at 220°C, the extrudate is filtered through a 180-mesh filter, metered and extruded (the pressure difference between the inlet and outlet of the metering pump is 2MPa), the cast film thickness is 50UM, 10°C air cooling, 4 times drafting High-speed drafting, release paper coating, winding and other processes to obtain polyimide films for flexible or thin-film solar cells. The performance of the thin-film solar cell using the thin film is 14.9% higher than that of the unused thin-film solar cell.

Embodiment 3

[0019] Example 3: 100 kg of polyimide resin (Changchun Institute of Applied Chemistry) and 0.1 kg of nano-aluminum powder were stirred and blended evenly with a stirrer at a temperature of 40°C; the above blend was introduced into a screw mixing extruder for blending and extrusion Out, the temperature is controlled at 260°C, the extrudate is filtered through a 180-mesh filter, metered and extruded (the pressure difference between the inlet and outlet of the metering pump is 2MPa), the thickness of the cast film is 50UM, 10°C air cooling, 4 times the drafting ratio, Release paper coating, winding and other processes to obtain polyimide films for flexible or thin film solar cells. The performance of the thin-film solar cell using the thin film is 8.9% higher than that of the unused thin-film solar cell.

technical field

[0001] The invention relates to a polyimide film for a thin-film solar cell and a preparation method thereof. The efficiency of the flexible or thin-film solar cell is directly improved by using the film to encapsulate the light-incident surface of the flexible or thin-film solar cell. Background technique

[0002] Organic polymer materials such as polymethyl methacrylate (PMMA), polystyrene (PS) and polycarbonate (PC) have excellent light transparency in the visible wavelength range, so these materials are often used as optical instrument. However, the temperature resistance of general-purpose polymer materials is often not enough, which limits their use in high-temperature environments. High temperature-resistant transparent materials refer to transparent materials that can withstand processing above 250 °C. They are mainly used for flexible solar cell backplanes, ITO backplanes for liquid crystal displays to replace fragile glass, alignment films for liqu...

Examples

Embodiment 1

[0017] Example 1: 100 kg of polyimide resin (Ningbo Jinshan Electronic Materials Co., Ltd.) and 0.02 kg of nano-aluminum powder were mixed evenly with a stirrer at a temperature of 10°C; the above blend was introduced into a screw mixing extruder for Blending extrusion, the temperature is controlled at 285°C, the extrudate is filtered through a 180-mesh filter, metered extrusion (the pressure difference between the inlet and outlet of the metering pump is 2MPa), the cast film thickness is 50UM, 10°C air cooling, 4 times the draft ratio Stretching, release paper coating, winding and other processes to obtain polyimide film for flexible or thin film solar cells. The performance of the thin-film solar cell using the thin film is 3.6% higher than that of the unused thin-film solar cell.

Embodiment 2

[0018] Example 2: Mix 100 kg of polyimide resin (Ningbo Jinshan Electronic Materials Co., Ltd.) and 0.0001 kg of nano-aluminum powder with a stirrer at a temperature of -10°C; import the above blend into a screw mixing extruder Perform blending and extrusion, the temperature is controlled at 220°C, the extrudate is filtered through a 180-mesh filter, metered and extruded (the pressure difference between the inlet and outlet of the metering pump is 2MPa), the cast film thickness is 50UM, 10°C air cooling, 4 times drafting High-speed drafting, release paper coating, winding and other processes to obtain polyimide films for flexible or thin-film solar cells. The performance of the thin-film solar cell using the thin film is 14.9% higher than that of the unused thin-film solar cell.

Embodiment 3

[0019] Example 3: 100 kg of polyimide resin (Changchun Institute of Applied Chemistry) and 0.1 kg of nano-aluminum powder were stirred and blended evenly with a stirrer at a temperature of 40°C; the above blend was introduced into a screw mixing extruder for blending and extrusion Out, the temperature is controlled at 260°C, the extrudate is filtered through a 180-mesh filter, metered and extruded (the pressure difference between the inlet and outlet of the metering pump is 2MPa), the thickness of the cast film is 50UM, 10°C air cooling, 4 times the drafting ratio, Release paper coating, winding and other processes to obtain polyimide films for flexible or thin film solar cells. The performance of the thin-film solar cell using the thin film is 8.9% higher than that of the unused thin-film solar cell.