不影响性能的无卤素光伏背板

Melinex® and Mylar® are registered trademarks of DuPont Teijin Films U.S. Limited Partnership. Teijin® Tetoron® is a registered trademarks of Teijin Limited and are licensed to DuPont Teijin Films US, Limited Partnership. Teonex® is registered trademark of Teijin DuPont Films Japan Limited and licensed to DuPont Teijin Films U.S. Limited Partnership. Copyright © 2004-2009 DuPont Teijin Films (UK) Ltd. All rights reserved. FOR A SUSTAINABLE FUTURE - Halogen free PV backsheet without compromising performance Dr Emily R Parnham, Dr William J Brennan, Anthony Whitehead, Ruairidh Mackenzie, Emma Ashford SNEC 2019 ❑ Accelerated weathering and field data for halogen free backsheet materials FOR A SUSTAINABLE FUTURE - Halogen free PV backsheet without compromising performance 2 Agenda ❑ PV backsheet at End-of-Life ❑ Conclusions and a vision for a sustainable PV backsheet future 3 Global annual installed data collected from: 1. Global market outlook 2017-2021: Solar boom continuous 2016 is another record solar year, Solar Business Hub, August 2017 2. Global Solar Market Demand Expected To Reach 100 Gigawatts in 2017, Says SolarPower Europe, Clean Technica, October 2017 3. Clean Energy Investment Exceeded $300 Billion Once Again in 2018, Bloomberg New Energy Finance, January 2019 25+ years product lifetime PV at End-of-Life Recycling ❑ Ideally all plastics should be recycled ❑ Post-consumer recycle streams already exist for PET ❑ This demonstrates the potential to incorporate recycling of PET backsheets into module End-of-Life disposal route Backsheet End-of-Life possibilities When recycling is not possible, alternatives include: Glycolysis Polymerisation Monomer PET 4 PET 5 Landfill – only realistic End-of-Life option for Fluorinated backsheets ❑ But Landfill is becoming scarce in some countries ❑ No recovery of material resources used to produce the plastic Incineration & Energy Recovery ❑ Heating the material to high temperatures in the presence of oxygen to give complete combustion, resulting in thermal energy recovery ❑ However increasing number of studies showing fluorinated plastics may release hazardous materials into the atmosphere Pyrolysis ❑ Heating the material to high temperatures in the absence of oxygen, breaks material down to smaller molecules that can be used as fuel ❑ However for fluorinated plastics this is not an option due to contaminated pyrolysis gas, oil and char Backsheet End-of-Life possibilities End-of-Life: PET backsheets offer a more sustainable future PET for PV Combine advanced filler technology, chemical know-how and process engineering 6 • Target 25 years performance for backsheet in field environment – By matching or exceeding the UV performance of materials known to last 25 years in the field eg PVF • Optimum performance vs cost PET for PV applications * Standard PET final measurement 1UV-TC as film became too brittle 7 DuPont Fast MAST 8 IEC 62788-7-2 Condition A3 Xenon weatherometer Irradiance @ 340nm = 0.8 CAT = 65 ° C, BPT = 90 ° C Humidity = 20% UVH PET Mylar® SPV7W outperforms PVF Florida Outdoor Weathering Real sun and rain, day and night, summer and winter exposure, but solar irradiance intensity 10x stronger ❑ Samples mounted facing the direct sun ❑ 100% of Solar Irradiation ❑ This is 10x backsheet exposure (assuming albedo of 10%) ❑ Therefore 2.5 years direct Florida weathering = 25 years backsheet UV exposure 5 years direct sun Florida = 50 years backside total UV exposure (albedo 10%) 10 Standard PET ❑ Yellows ❑ Brittles (ETB 3 years Australia 6 years Czech Republic 8 years Italy 10 years 13 Field data Coveme dyMat® PYE backsheets Outer film DTF PET Melinex® 243 10 years Cfa climate - Italy Coveme dyMat® PYE backsheet Outer film DTF PET Mylar® SPV7W 3 years + Cfa climate - USA UV and Hydrolysis stabilised PET Tested to: ❑ ISO 4892-2 ❑ Direct Florida ❑ IEC 62788-7-2 (A3) Results: ❑ No cracking ❑ No yellowing ❑ No hotspots 14 Field data Coveme dyMat® PYE backsheets Outer film DTF PET Melinex® 243 6 years Australia Results: ❑ No cracking – front or backside of backsheet ❑ No yellowing ❑ No hotspots 15 Field data Coveme dyMat® PYE backsheets Outer film DTF PET Melinex® 243 8 years Czech Republic Results: ❑ No cracking – front or backside of backsheet ❑ No yellowing ❑ No hotspots 16 Conclusion ❑ UV and Hydrolysis stabilised PET for PV applications: ❑ Matches PVF performance in accelerated weathering ❑ Matches PVF performance for actual field data to-date ❑ UV and Hydrolysis stabilised PET for PV applications: ❑ Advantage over fluorinated counter parts when considering End-of-Life and recyclability Ref: https://www.dupont.com/products-and-services/solar-phtovoltaic-materials/testing-standards/introducing-MAST.html 17 For a Sustainable Future Glycolysis Polymerisation Monomer PETPET Film and laminate into backsheet Glycolysis DuPont Teijin Films can manufacture PET with upto 50% rPET The Vision using “Chemical Recycling” 18 Thank you for your attention ❑ DuPont Teijin Films colleagues Acknowledgments