CN105038156A - Solar cell backboard polyester film with high reflectivity and preparing method of solar cell backboard polyester film - Google Patents

Abstract

The invention discloses a solar cell backboard polyester film with high reflectivity and a preparing method of the solar cell backboard polyester film. The film is prepared from polyester master batch chips and pure polyester chips according to the mass ratio of (10-50):(90-50). The preparing method of the solar cell backboard polyester film with high reflectivity comprises the steps that the master batch chips and the pure polyester chips are arranged in an extruder to be melted and extruded according to the mass ratio of (10-50):(90-50); then, a film casting sheet is attached to a cooling barrel at high pressure, and the solar cell backboard polyester film is obtained after longitudinal draw, transverse draw and sizing rolling are carried out. The solar cell backboard polyester film has high reflectivity and excellent anti-aging performance.

Description

A kind of high-reflectivity solar cell backboard polyester film and preparation method thereof

technical field

The invention relates to a high-reflectivity solar cell backboard polyester film and a preparation method thereof.

Background technique

One of the necessary components of a solar cell is the back sheet, which is the protective material on the back of the cell panel. Its function is to fix the solar cell and also play a supporting role. A qualified solar cell back sheet must have sufficient resistance to light radiation. For the function of lighting, it must also have a high reflectance value and anti-aging performance.

The prior art polyester film for solar backsheets has poor reflectivity and anti-aging performance, which often becomes the performance bottleneck of solar cells.

Contents of the invention

The object of the present invention is to provide a kind of high reflectivity solar cell back plate polyester film and its preparation method.

The technical scheme that the present invention takes is:

A high-reflectivity solar battery backplane polyester film is made of polyester masterbatch slices and pure polyester slices according to the mass ratio (10-50): (90-50).

The polyester masterbatch chip is made of 70-95 parts of monomer, 5-30 parts of filler, 0.1-1 part of anti-hydrolysis agent, 0.1-1 part of antioxidant, 0.1-1 part of UV additive and catalyst.

The filler is a compound of silicon dioxide, titanium dioxide, halloysite, and barium sulfate according to the mass ratio (5-20):(10-30):(2-10):(10-40).

The anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent.

The antioxidant is at least one of phosphite antioxidants, hindered phenol antioxidants, thioester antioxidants and composite antioxidants.

The ultraviolet absorber is at least one of salicylate ultraviolet absorbers, benzophenone ultraviolet absorbers and benzotriazole ultraviolet absorbers.

A kind of preparation method of polyester film of solar cell back sheet with high reflectivity, the steps are:

The masterbatch chips and pure polyester chips are placed in the extruder according to the mass ratio (10-50): (90-50) to melt and extrude; Stretch, shape and roll.

The multiple of longitudinal stretching is 2-4 times; the multiple of transverse stretching is 2-5 times.

The temperature for shaping and winding is 100~200°C.

The thickness of the polyester film is 50-350 μm.

The beneficial effects of the present invention are:

The solar backboard polyester film of the invention has high reflectivity and excellent aging resistance.

Detailed ways

A high-reflectivity solar battery backplane polyester film is made of polyester masterbatch slices and pure polyester slices according to the mass ratio (10-50): (90-50).

Preferably, the polyester masterbatch chips consist of 70-95 parts by mass of monomers, 5-30 parts by mass of fillers, 0.1-1 parts by mass of anti-hydrolysis agents, 0.1-1 parts by mass of antioxidants, and 0.1-1 parts by mass of UV additives. 1 part by mass and a catalyst.

Preferably, the monomer is composed of terephthalic acid and ethylene glycol in a molar ratio of 1: (1.2-1.3);

Preferably, the filler is a composite of silica, titanium dioxide, halloysite, and barium sulfate according to the mass ratio (5-20): (10-30): (2-10): (10-40) things.

Preferably, the anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent.

Preferably, the antioxidant is at least one of phosphite antioxidants, hindered phenolic antioxidants, thioester antioxidants, composite antioxidants; the selected antioxidants are all It is an antioxidant in the prior art, such as hindered phenolic antioxidant, which can be BHT, 1222, 1076, 1135, 54, 730, BHA, SP, PCRBF, 2246, methylene 736, BBM, 2246-S,

At least one of 736, 4426-S, 300, AO-80, AO-60, 1010, 3114, 3125, KY-1330, AC-400; phosphite antioxidant, such as 168, 626 At least one; thioester antioxidant, such as at least one of DLTDP, DSTDP; composite antioxidant, such as at least one of B225, B215, B900, B911, GX2921.

Preferably, the ultraviolet absorber is at least one of salicylate ultraviolet absorbers, benzophenone ultraviolet absorbers, and benzotriazole ultraviolet absorbers; for example, it can be UV-234, UV At least one of -326, UV-327, UV-328, UV-329, UV-320, UV-360, UV-P, UV-1577, UV-1130, UV-9, UV-531;

The preparation method of masterbatch chip is prior art, for example, its preparation process is:

1) Put ethylene glycol into the beating kettle, then add terephthalic acid to make slurry;

2) Put ethylene glycol into the catalyst preparation kettle, then add the catalyst antimony trioxide, and stir evenly to make a catalyst liquid;

3) Mix the additive with ethylene glycol to make an additive liquid;

4) Put the slurry and catalyst liquid into the esterification kettle, heat for esterification reaction, and obtain esterified products;

5) After the esterification reaction, press the esterified product into the pre-condensation tank for pre-condensation, add the additive solution, and vacuum during the reaction to discharge the excess ethylene glycol;

6) Press the pre-condensed product into the final polycondensation tank, and further carry out the polycondensation reaction to obtain a melt;

7) Cool the melt and slice it;

8) Transport the slices to the crystallizer, heat to 150-160°C, and crystallize;

9) Then transfer to the solid-phase reactor, vacuumize and heat, keep warm, and further increase the viscosity;

10) Discharge and packaging.

Preferably, the dosage ratio of ethylene glycol in step 1), step 2) and step 3) is 15.4-17:1:1.

Preferably, the molar ratio of the total amount of terephthalic acid to ethylene glycol is 1:1.2-1.3;

Preferably, in the preparation method, the total amount of terephthalic acid and ethylene glycol used is 70-95 parts by mass;

Preferably, in step 2), the amount of antimony trioxide used is 0.03-0.04% of the total mass of ethylene glycol and terephthalic acid;

Preferably, the additive is a compound of 5-30 parts by mass of filler, 0.1-1 part by mass of anti-hydrolysis agent, 0.1-1 part by mass of antioxidant, and 0.1-1 part by mass of UV additive;

Correspondingly, a method for preparing a high-reflectivity solar cell backplane polyester film, the steps are:

The masterbatch chips and pure polyester chips are placed in the extruder according to the mass ratio (10-50): (90-50) to melt and extrude; Stretch, shape and roll.

Preferably, the multiple of longitudinal stretching is 2-4 times; the multiple of transverse stretching is 2-5 times.

Preferably, the temperature for shaping and winding is 100-200°C.

Preferably, the thickness of the finally prepared polyester film is 50-350 μm.

The present invention will be further described below in conjunction with specific examples ("parts" involved in the embodiments are: "parts by mass"):

Example 1:

A high-reflectivity solar battery backplane polyester film, which is made of polyester masterbatch chips and pure polyester chips at a mass ratio of 15:85;

The polyester masterbatch chip is made of 70 parts of monomer, 5 parts of filler, 0.1 part of anti-hydrolysis agent, 0.1 part of antioxidant, 0.1 part of UV additive and catalyst;

The monomer is terephthalic acid and ethylene glycol in a molar ratio of 1:1.2; the filler is a compound of silicon dioxide, titanium dioxide, halloysite, and barium sulfate in a mass ratio of 5:10:2:10. complex; the described anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent; the described antioxidant is a compound of 1010 and 168 according to the mass ratio of 1:1; the described UV auxiliary agent is UV- The compound of P and UV-326 according to the mass ratio of 1:1; the catalyst used is Sb ₂ O ₃ .

A kind of preparation method of polyester film of solar cell back sheet with high reflectivity, the steps are:

The masterbatch chips and pure polyester chips are placed in the extruder according to the mass ratio of 15:85 to be melted and extruded; then the sheets are cast with high-pressure film on the cold drum, longitudinally stretched, transversely stretched, shaped and rolled.

Preferably, the multiple of longitudinal stretching is 3.3 times; the multiple of transverse stretching is 3.6 times.

Preferably, the temperature for setting and rolling is 180°C.

The thickness of the finally prepared film is: 188 μm.

Example 2:

A high-reflectivity solar cell backboard polyester film, which is made of polyester masterbatch slices and pure polyester slices according to a mass ratio of 12:88;

The polyester masterbatch chip is made of 95 parts of monomer, 30 parts of filler, 1 part of anti-hydrolysis agent, 1 part of antioxidant, 1 part of UV additive and catalyst;

The monomer is terephthalic acid and ethylene glycol in a molar ratio of 1:1.2; the filler is a compound of silicon dioxide, titanium dioxide, halloysite, and barium sulfate in a mass ratio of 5:15:8:20. complex; the described anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent; the described antioxidant is a compound of 1010 and 168 according to the mass ratio of 1:1; the described UV auxiliary agent is UV- The compound of P and UV-326 according to the mass ratio of 1:1; the catalyst used is Sb ₂ O ₃ .

A kind of preparation method of polyester film of solar cell back sheet with high reflectivity, the steps are:

The masterbatch chips and pure polyester chips are placed in the extruder according to the mass ratio of 12:88 and melted and extruded; then the sheets are cast with high-pressure film on the cold drum, longitudinally stretched, transversely stretched, shaped and rolled.

Preferably, the multiple of longitudinal stretching is 3.2 times; the multiple of transverse stretching is 3.6 times.

Preferably, the temperature for setting and rolling is 150°C.

The thickness of the finally prepared film is: 250 μm.

Example 3:

A high-reflectivity solar cell backboard polyester film, which is made of polyester masterbatch slices and pure polyester slices according to a mass ratio of 18:82;

The polyester masterbatch chip is made of 80 parts of monomer, 25 parts of filler, 0.8 part of anti-hydrolysis agent, 0.8 part of antioxidant, 0.9 part of UV additive and catalyst;

The monomer is terephthalic acid and ethylene glycol in a molar ratio of 1:1.2; the filler is a compound of silicon dioxide, titanium dioxide, halloysite, and barium sulfate in a mass ratio of 5:30:10:40. complex; the described anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent; the described antioxidant is a compound of 1010 and 168 according to the mass ratio of 1:1; the described UV auxiliary agent is UV- The compound of P and UV-326 according to the mass ratio of 1:1; the catalyst used is Sb ₂ O ₃ .

A kind of preparation method of polyester film of solar cell back sheet with high reflectivity, the steps are:

The masterbatch chips and pure polyester chips are placed in the extruder according to the mass ratio of 18:8, and then melted and extruded; then the sheets are cast with high-pressure film on the cold drum, stretched longitudinally, stretched transversely, and shaped and rolled.

Preferably, the multiple of longitudinal stretching is 3.3 times; the multiple of transverse stretching is 3.7 times.

Preferably, the temperature for setting and rolling is 185°C.

The thickness of the finally prepared film is: 125 μm.

Example 4:

A high-reflectivity solar cell backboard polyester film, which is made of polyester masterbatch slices and pure polyester slices according to the mass ratio of 20:80;

The polyester masterbatch chip is made of 85 parts of monomer, 28 parts of filler, 0.8 part of anti-hydrolysis agent, 0.8 part of antioxidant, 0.9 part of UV additive and catalyst;

The monomer is a molar ratio of terephthalic acid to ethylene glycol of 1:1.25; the filler is a compound of silicon dioxide, titanium dioxide, halloysite, and barium sulfate in a mass ratio of 5:30:10:40. complex; the described anti-hydrolysis agent is a carbodiimide anti-hydrolysis agent; the described antioxidant is a compound of 1010 and 168 according to the mass ratio of 1:1; the described UV auxiliary agent is UV- The compound of P and UV-326 according to the mass ratio of 1:1; the catalyst used is Sb ₂ O ₃ .

A kind of preparation method of polyester film of solar cell back sheet with high reflectivity, the steps are:

The masterbatch chips and pure polyester chips are placed in the extruder according to the mass ratio of 20:8, and then melted and extruded; then the sheets are cast with high-pressure film on the cold drum, longitudinally stretched, transversely stretched, shaped and rolled.

Preferably, the multiple of longitudinal stretching is 3.3 times; the multiple of transverse stretching is 3.7 times.

Preferably, the temperature for setting and rolling is 200°C.

The thickness of the finally prepared thin film is: 100 μm.

Carry out relevant test to embodiment product, comprise reflectivity and the tensile test of MD, TD direction before and after forced aging, measure tensile strength retention rate; The result is as follows:

Claims (10)

1. a high-reflectivity solar cell backboard polyester film, is characterized in that: its be by polyester masterbatch cut into slices with pure polyester slice according to mass ratio (10-50): (90-50) makes.

2. a kind of high-reflectivity solar cell backboard polyester film according to claim 1, is characterized in that: described polyester masterbatch section is made up of monomer 70 ~ 95 parts, filler 5 ~ 30 parts, hydrolysis-resisting agent 0.1 ~ 1 part, 0.1 ~ 1 part, oxidation inhibitor, UV auxiliary agent 0.1 ~ 1 part and catalyzer.

3. a kind of high-reflectivity solar cell backboard polyester film according to claim 1 and 2, is characterized in that: described filler be silicon-dioxide, titanium dioxide, halloysite, barium sulfate according to mass ratio (5 ~ 20): (10 ~ 30): (2 ~ 10): the compound of (10 ~ 40).

4. a kind of high-reflectivity solar cell backboard polyester film according to claim 1 and 2, is characterized in that: described hydrolysis-resisting agent is Carbodiimides hydrolysis-resisting agent.

5. a kind of high-reflectivity solar cell backboard polyester film according to claim 1 and 2, is characterized in that: described oxidation inhibitor is at least one in phosphite ester kind antioxidant, Hinered phenols antioxidant, monothioester kind antioxidant, composite antioxidant.

6. a kind of high-reflectivity solar cell backboard polyester film according to claim 1 and 2, is characterized in that: described UV light absorber is at least one in salicylate ultraviolet absorption agent, benzophenone ultraviolet absorption agent, Benzotriazole Ultraviolet Stabilizer.

7. the preparation method of a kind of high-reflectivity solar cell backboard polyester film according to claim 1, is characterized in that: step is:

By the masterbatch of claim 1 section with pure polyester slice according to mass ratio (10-50): (90-50) is placed in forcing machine and melt extrudes; Then high pressure membrane slab, longitudinal stretching, cross directional stretch, sizing rolling on cold drum.

8. the preparation method of a kind of high-reflectivity solar cell backboard polyester film according to claim 7, is characterized in that: the multiple of longitudinal stretching is 2-4 times; The multiple of cross directional stretch is 2-5 times.

9. the preparation method of a kind of high-reflectivity solar cell backboard polyester film according to claim 7, is characterized in that: the temperature of sizing rolling is 100 ~ 200 DEG C.

10. the preparation method of a kind of high-reflectivity solar cell backboard polyester film according to claim 7, is characterized in that: the thickness of polyester film is 50-350 μm.