CN104409546B - A kind of solar cell backboard and preparation method thereof - Google Patents

Abstract

The invention discloses a solar cell backboard and a preparation method thereof, comprising an intermediate substrate, the surface of which is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 30-50 parts of titanium dioxide, 20-30 parts of methyl styrene, 20-40 parts of isopropyl acetate, 50-60 parts of polyamide resin, 30-50 parts of copolymerized polyethylene, 45-55 parts of copolymerized polypropylene resin, polysebacyldecanediamine 50-70 parts, 0.1-1 part of 2-hydroxy-4-n-octyloxybenzophenone. Preparation method: a. Obtain the weather-resistant layer composition; b. Coat the weather-resistant layer composition on the substrate; c. Keep it at a temperature lower than -20°C for 15-25 minutes; d. Keep it at 90-110°C Keep 1-2h under the condition. The solar battery back plate prepared by the invention has excellent mechanical properties such as heat and humidity resistance, aging performance and tensile strength, and has simple manufacturing process and low cost.

Description

A kind of solar battery back plate and preparation method thereof

technical field

The invention relates to the field of solar cells, in particular to a solar cell backboard and a preparation method thereof.

Background technique

The current main energy source of mankind comes from fossil energy, but in the next hundred years or so, fossil energy will be exhausted, and in the process of using fossil energy, a large amount of carbon dioxide will be emitted, causing the deterioration of the earth's climate. Green renewable energy without environmental pollution is the only way to solve human energy challenges and low carbon emissions. Compared with other new energy sources, due to the advantages of the most abundant resources, the most direct energy conversion, the cleanest environmental protection, no fuel, and zero emissions, solar energy has become the easiest, most reliable, and most economical new energy source.

Solar cells, also known as photovoltaic cells, are devices that directly convert light energy into electrical energy through the photoelectric effect or photochemical effect, and are widely used in military, aerospace, industry, commerce, agriculture, communications, household appliances, and public facilities.

Solar cell power generation technology mainly includes crystalline silicon solar cells and thin-film solar cells. No matter what kind of solar cell is, it needs to be prepared into a solar cell module to effectively protect and package the semiconductor cell in order to generate electricity effectively for a long time. The solar backsheet is the structural packaging material of the solar cell module, which plays a great role in prolonging the service life of the solar cell and is an indispensable part of the solar cell module. The material for preparing the backsheet should have reliable insulation, Water resistance, mechanical properties, UV aging resistance and humidity and heat aging resistance.

The traditional solar cell backsheet structure is mainly to attach a fluoropolymer film on the upper and lower surfaces of the polyethylene terephthalate layer. The patent with application number 201110188877.4 discloses a solar cell backsheet, including a gas barrier layer, a process-resistant layer and several outer coating layers, and at least one outer coating layer is a composite made of polyimide and Teflon Membrane, the composite membrane can be composed of polyimide film and Teflon film, or a co-extrusion film of polyimide and Teflon, but its resistance to heat and humidity, aging and The mechanical properties still need to be further improved.

Contents of the invention

The object of the present invention is to provide a solar battery back sheet with excellent heat and humidity resistance, aging resistance and mechanical properties and a preparation method thereof in order to overcome the above deficiencies in the prior art.

A solar cell back sheet of the present invention comprises an intermediate substrate, the surface of which is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 30-50 parts of titanium dioxide, m-methylstyrene 20-30 parts, 20-40 parts of isopropyl acetate, 50-60 parts of polyamide resin, 30-50 parts of copolymerized polyethylene, 45-55 parts of copolymerized polypropylene resin, 50-70 parts of polydecanediamide , 0.1-1 parts of 2-hydroxy-4-n-octyloxybenzophenone.

Preferably, a solar battery back sheet includes an intermediate substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 35-45 parts of titanium dioxide, m-methylstyrene 22-28 parts, 25-35 parts of isopropyl acetate, 52-58 parts of polyamide resin, 35-45 parts of copolymerized polyethylene, 48-52 parts of copolymerized polypropylene resin, 55-65 parts of polydecanediamide , 0.5-0.8 parts of 2-hydroxy-4-n-octyloxybenzophenone.

More preferably, a solar battery back sheet includes an intermediate substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 40 parts by mass of titanium dioxide, 25 parts by m-methylstyrene , 30 parts of isopropyl acetate, 55 parts of polyamide resin, 40 parts of copolymerized polyethylene, 50 parts of copolymerized polypropylene resin, 60 parts of polydecanediamide, 2-hydroxy-4-n-octyloxydiphenyl 0.6 parts of methyl ketone.

Preferably, the thickness of the weather-resistant layer is 60-80 microns.

A method for preparing a solar battery back plate, comprising the following steps:

a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 600-700°C, and then add 2- Hydroxy-4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition;

b. Coating the weather-resistant layer composition on a substrate of 100-130 microns to obtain a battery back plate;

c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 15-25 minutes;

d. Put the battery backsheet at 90-110° C. for 1-2 hours, and cool it at room temperature to obtain the solar battery backsheet.

Preferably, the heating described in step a is up to 650°C.

Preferably, the weather-resistant layer composition described in step b is coated on a 120 micron substrate.

Preferably, as described in step c, the battery back sheet obtained in step b is kept at a temperature lower than -20°C for 20 minutes.

Preferably, as described in step d, the battery back plate is kept at 100° C. for 1.5 h.

Beneficial effects: the solar cell backboard prepared by the invention has excellent mechanical properties such as resistance to heat and humidity, aging performance and tensile strength.

Compared with the backboard of the prior art, the solar cell backboard provided by the present invention is as follows:

1. The present invention coats the weather-resistant layer on the surface of the substrate. Compared with the prior art where the upper and lower surfaces of the polyethylene terephthalate layer are laminated with a fluoropolymer film, the manufacturing process is simpler and the cost is lower.

2. The invention improves the water-absorbing performance and heat-and-humidity resistance performance of the polyamide resin, and improves the compatibility at the same time.

detailed description

Example 1

A solar battery back sheet, including a middle substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 30 parts of titanium dioxide, 20 parts of m-methylstyrene, isoacetic acid 20 parts of propyl ester, 50 parts of polyamide resin, 30 parts of copolymerized polyethylene, 45 parts of copolymerized polypropylene resin, 50 parts of polydecanediamide, 0.1 part of 2-hydroxy-4-n-octyloxybenzophenone .

A method for preparing a solar battery back plate, comprising the following steps:

a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 600°C, and then add 2-hydroxy- 4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition;

b. Coating the weather-resistant layer composition on a substrate with a thickness of 100 microns to obtain a battery back plate;

c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 15 minutes;

d. Keep the battery backsheet at 90° C. for 1 hour, and cool it at room temperature to obtain a solar battery backsheet.

Example 2

A solar battery back sheet, including a middle substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 50 parts of titanium dioxide, 30 parts of m-methylstyrene, isoacetic acid 40 parts of propyl ester, 60 parts of polyamide resin, 50 parts of copolymerized polyethylene, 55 parts of copolymerized polypropylene resin, 70 parts of polydecanediamide, 1 part of 2-hydroxy-4-n-octyloxybenzophenone .

A method for preparing a solar battery back plate, comprising the following steps:

a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 700°C, and then add 2-hydroxy- 4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition;

b. Coating the weather-resistant layer composition on a substrate with a thickness of 130 microns to obtain a battery back plate;

c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 25 minutes;

d. Put the battery backsheet at 110° C. for 2 hours, and cool it at room temperature to obtain a solar battery backsheet.

Example 3

A solar battery back sheet, including a middle substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 35 parts of titanium dioxide, 22 parts of m-methylstyrene, isoacetic acid 25 parts of propyl ester, 52 parts of polyamide resin, 35 parts of copolymerized polyethylene, 48 parts of copolymerized polypropylene resin, 55 parts of polydecanediamide, 0.5 parts of 2-hydroxy-4-n-octyloxybenzophenone .

A method for preparing a solar battery back plate, comprising the following steps:

a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 620°C, and then add 2-hydroxy- 4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition;

b. Coating the weather-resistant layer composition on a substrate of 110 microns to obtain a battery back plate;

c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 18 minutes;

d. Keep the battery backsheet at 95° C. for 1.2 hours, and cool it at room temperature to obtain a solar battery backsheet.

Example 4

A solar battery back sheet, including a middle substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 45 parts of titanium dioxide, 28 parts of m-methylstyrene, isoacetic acid 35 parts of propyl ester, 58 parts of polyamide resin, 45 parts of copolymerized polyethylene, 52 parts of copolymerized polypropylene resin, 65 parts of polydecanediamide, 0.8 parts of 2-hydroxy-4-n-octyloxybenzophenone .

A method for preparing a solar battery back plate, comprising the following steps:

a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 680°C, and then add 2-hydroxy- 4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition;

b. Coating the weather-resistant layer composition on a substrate with a thickness of 115 microns to obtain a battery back plate;

c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 22 minutes;

d. Put the battery backsheet at 105° C. for 1.8 hours, and cool it at room temperature to obtain a solar battery backsheet.

Example 5

A solar battery back sheet, including a middle substrate, the surface of the substrate is coated with a weather-resistant layer, and the weather-resistant layer is composed of the following components in parts by mass: 40 parts of titanium dioxide, 25 parts of m-methylstyrene, isoacetic acid 30 parts of propyl ester, 55 parts of polyamide resin, 40 parts of copolymerized polyethylene, 50 parts of copolymerized polypropylene resin, 60 parts of polydecanediamide, 0.6 parts of 2-hydroxy-4-n-octyloxybenzophenone .

A method for preparing a solar battery back plate, comprising the following steps:

a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 650°C, and then add 2-hydroxy- 4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition;

b. Coating the weather-resistant layer composition on a substrate of 120 microns to obtain a battery back plate;

c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 20 minutes;

d. Keep the battery backsheet at 100° C. for 1.5 hours, and cool it at room temperature to obtain a solar battery backsheet.

The solar cell backsheet prepared in the above embodiment was tested for performance, and the test data were collected. The test results are shown in Table 1.

Table 1

It can be seen from Table 1 that the solar cell back sheet prepared by the present invention has excellent mechanical properties such as heat and humidity resistance, aging performance and tensile strength, among which the performance of the solar cell back sheet prepared in Example 5 is the best, and the manufacturing process of the present invention is simple, and the preparation The cost is lower.

Claims (9)

1. A solar battery back plate, comprising a middle substrate, the surface of the substrate is coated with a weather-resistant layer, characterized in that the weather-resistant layer is composed of the following components in parts by mass: 30-50 parts of titanium dioxide, m-toluene 20-30 parts of ethylene, 20-40 parts of isopropyl acetate, 50-60 parts of polyamide resin, 30-50 parts of copolymerized polyethylene, 45-55 parts of copolymerized polypropylene resin, 50-70 parts of polydecanediamide 0.1-1 part of 2-hydroxy-4-n-octyloxybenzophenone. 2. A solar battery back sheet according to claim 1, characterized in that the weather-resistant layer is composed of the following components in parts by mass: 35-45 parts of titanium dioxide, 22-28 parts of m-methylstyrene, 25-35 parts of isopropyl acetate, 52-58 parts of polyamide resin, 35-45 parts of copolymerized polyethylene, 48-52 parts of copolymerized polypropylene resin, 55-65 parts of polysebacyldecanediamine, 2-hydroxy- 0.5-0.8 parts of 4-n-octyloxybenzophenone. 3. A solar battery back sheet according to claim 1, characterized in that the weather-resistant layer is composed of the following components in parts by mass: 40 parts of titanium dioxide, 25 parts of m-methylstyrene, isopropyl acetate 30 parts, 55 parts of polyamide resin, 40 parts of copolymerized polyethylene, 50 parts of copolymerized polypropylene resin, 60 parts of polydecanediamide, 0.6 part of 2-hydroxy-4-n-octyloxybenzophenone. 4. A solar battery back sheet according to claim 1, characterized in that the thickness of the weather-resistant layer is 60-80 microns. 5. A method for preparing a solar battery back sheet as claimed in any one of claims 1 to 3, characterized in that it comprises the following steps: a. Mix titanium dioxide, m-methylstyrene, isopropyl acetate, polyamide resin, copolymerized polyethylene, copolymerized polypropylene resin, and polydecanediamide, heat to 600-700°C, and then add 2- Hydroxy-4-n-octyloxybenzophenone, after stirring evenly, obtains weather-resistant layer composition; b. Coating the weather-resistant layer composition on a substrate with a thickness of 100-130 microns to obtain a battery back plate; c. Keep the battery back plate obtained in step b at a temperature lower than -20°C for 15-25 minutes; d. Put the battery backsheet at 90-110° C. for 1-2 hours, and cool it at room temperature to obtain the solar battery backsheet. 6. The method for preparing a solar cell backsheet according to claim 5, characterized in that the heating to 650°C is performed in step a. 7. The method for preparing a solar cell backsheet according to claim 5, characterized in that the weather-resistant layer composition described in step b is coated on a substrate with a thickness of 120 microns. 8. A method for preparing a solar battery backsheet according to claim 5, characterized in that the solar battery backsheet obtained in step b is kept at a temperature lower than -20°C for 20 minutes in step c. 9 . The method for preparing a solar battery backsheet according to claim 5 , characterized in that in step d, the battery backsheet is kept at 100° C. for 1.5 hours.