From：solar mounting structure from China Release time：2018-11-05
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Photovoltaic panel is one of the decisive factors that affect the investment income. However, the safety and direction of the prevailing fluorine-containing backplane are becoming more and more prominent.
On November 12, 2015, employees in the OEM industry of a certain component company in hangzhou finished half a day's work and began their lunch break as usual. Since lunch, however, 65 workers in the factory have been experiencing fever, cough, chest tightness, headache and dizziness. After investigating the cause of the accident, it was found that the accident was caused by the burning of photovoltaic backplate material, which formed a highly toxic substance -- hydrogen fluoride.
The crystalline silicon solar cell module is encapsulated into a "sandwich" structure in the order of -- EVA -- battery sheet -- EVA -- backplate. As the "protective wall" on the back of pv modules, the back panel is an important part of pv modules, which not only plays the role of encapsulation, but also ensures that the internal batteries of pv modules are not affected by the environment.
"For investors, they are very concerned about the quality and safety of the backplane when investing in and buying back pv power stations," said xu yongbang, vice President of dongxu blue sky. If the life of the component is not up to par, all the investment measures are castles built on the beach. As most of the photovoltaic modules are in large climate change and harsh environment, the backplate materials used should be stable and durable. In general, the accepted tolerance period is 25 years.
The quality of component auxiliary material is one of the decisive factors influencing the investment income. However, the problem of component security and storage and direction after decommissioning is gradually emerging. The huge installed capacity of photovoltaic has given birth to the photovoltaic panel market, but there are unknown hidden concerns behind this market which have been ignored for a long time. Currently, most of the photovoltaic module recycling is based on incineration and landfill, and some groups have begun to develop the module recycling technology, but there is still no effective solution to the problems such as secondary pollution caused by fluorine backplane.
"The power stations in the desert are still to be told," says one backplane worker.
In the future, 60% of the distributed products will be placed on the relatively densely populated residential buildings and industrial and commercial rooftops, but the safety and environmental protection of auxiliary materials have cast an awkward shadow over the development of distributed photovoltaic. This, of course, is the result of a combination of market, technology and policy.
The one that contains fluorine backplate is alone big
The first foreign suppliers to enter the backplane material sector were strong enough, with dupont alone dominating almost 75% of the pv accessories market.
dupont is the world's largest supplier of photovoltaic backplate coating, with more than 20 years of stable operation experience. Pv power plants have a long life and equipment must have good quality assurance, "" a backplane supplier told energy.
About 20 years ago, dupont group developed the well-known TPT structure, namely Tedlar//PET//Tedlar structure. With the development of photovoltaic power station in China, photovoltaic backplate is becoming a strong pedal for dupont to rapidly expand its market share in China.
However, TPT materials are not the only option for pv owners, with products in circulation such as royal DSM of the Netherlands, akoma of France, SKC of South Korea and wu yu of Japan. In addition, less expensive and more efficient solar panel products than the TPT structure are flooding the market. From dupont's first product PVF entered the photovoltaic market, the market has been developing for 30 years. Currently, photovoltaic backplane can be divided into five types according to its composition structure: FPF, FPX, PPX, PA and single-layer PET structure. Almost all of these structural layers are bonded with an adhesive, which is prepared by a composite process to maintain a 25-year interlaminar bond.
In recent years, with the improvement of innovation ability, the price of backplane materials is constantly decreasing. Generally speaking, the material containing fluorine wants high polymer synthesis. In order to obtain higher quality, its heterogenous material must be cleaned up, the purity is required to be very high, and the synthetic molecular weight requires a long molecular chain to achieve the promised performance. At present, the cost of dupont TPT backboard is 35 to 45 yuan per cubic meter. After decades of planning, the cost of industry has been reduced to the limit. The non-fluorine APE has reached 18 to 20 yuan per cubic meter.
But that still doesn't change the awkward status of the non-fluorinated material backplates, with fluorine-containing TPT materials still accounting for nearly 75% of the market.
there's a lot of branding and there's also a psychological effect on the customer." " A solar panel supplier in suzhou told energy. "Dupont has been in China for more than 30 years. Since then, fluorine-containing TPT materials began to enter China. With the expansion of dupont group, fluorine-containing TPT materials have become the mainstream of photovoltaic modules." A backplane supplier told energy. "" owners are more out of stability concerns. The material industry has a sentence, dupont, chemical industry shake three shake, see dupont in the field of chemical materials impact.
Dupont aggressively sidelined competitors during the bidding process. In their opinion, the experimental data is different from the practice situation after all. Dupont has practiced for at least 25 years.
As the owner of the backboard and coating is generally the operator, the bidding result of auxiliary materials is often the reflection of the owner's will, a photovoltaic power plant operator told the energy reporter: "sometimes, in the bidding documents, the general rule is' must use TPT backboard '". In this way, the owner has the right to choose, establish the bidding rules, and then choose the supplier according to his will. Some PET, APE and other fluorine-free backboards are excluded.
"APE, the problem with PET is that companies have not been in the photovoltaic industry for a long time. The practicality of photovoltaic module operation cannot compare with that of dupont. Historically, it has not been used on a large scale. The industry said.
As for the situation of APE backboard, CAI shuyi, deputy general manager of shangshan new material technology co., LTD. (hereinafter referred to as "shangshan new material"), a wholly-owned subsidiary of DSM group of the Netherlands, can sympathize with it. In 2014, CAI shuyi left dupont group and founded shangshan new material, starting a long exploration. Later, DSM of the Netherlands secretly conducted a two-year performance test on the environmental-friendly APE backboard developed by the former, and formally proposed the purchase of shangshan after determining the performance of the backboard.
Compared with TPT products, APE has no fluorine-containing materials, and no fluorine-containing toxic substances are discharged during incineration and degradation treatment, meeting the requirements of green design. No thermosetting glue is used in the production process, which is in line with the trend of green manufacturing and conducive to recycling.
"In terms of operation, APE has excellent reliability and has the best water resistance in China," said CAI. In the second half of last year, longjile leaf back plate coating orders.