Coating knowledge: application of fluorocarbon coating in solar cell backplane

It is suggested that there are two main types of dorsal membrane, one is fluorine-containing membrane, the other is fluorine-free membrane There are two kinds of fluorine-containing back films: double-sided fluorine-containing (such as TPT) and single-sided fluorine-containing (such as TPE) At present, most of the mainstream solar cell back films are double-sided fluorine-containing compound back films and coating back films The back films (TPT, kpk, etc.) of composite solar cells are mostly made of PVF or PVDF, which are developed by some fluorine chemical enterprises in Europe and America, and are bonded and compounded with pet substrate by adhesives The back film shall meet the environmental test of solar cell components for 25 years in terms of aging resistance, insulation resistance, moisture resistance, etc In the foreseeable future, the back membrane materials will still be fluorine-containing Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: the pool back membrane is mainly divided into two categories: fluorine-containing back membrane and fluorine-free back membrane There are two kinds of fluorine-containing back films: double-sided fluorine-containing (such as TPT) and single-sided fluorine-containing (such as TPE) At present, most of the mainstream solar cell back films are double-sided fluorine-containing compound back films and coating back films The back films (TPT, kpk, etc.) of composite solar cells are mostly made of PVF or PVDF, which are developed by some fluorine chemical enterprises in Europe and America, and are bonded and compounded with pet substrate by adhesives The back film shall meet the environmental test of solar cell components for 25 years in terms of aging resistance, insulation resistance, moisture resistance, etc In the foreseeable future, the back film materials will still be the mainstream of fluorine-containing back film In the background of photovoltaic modules becoming more and more sensitive to cost, and foreign large factories are in a monopoly position for the compound fluorine film The development of coating back film with excellent quality is the necessary way to realize the localization of back film The coated back film was produced later, but the technology developed fastest and the market share increased year by year At the beginning of the development and application of double-sided coating type back film technology, many people in the industry have doubts about the development of coating type back film After several years of application practice, it has been proved that coating type back film is used in physical machinery The performance, electrical insulation performance, humidity and heat resistance performance, EVA bonding performance, and silica gel bonding performance can meet the requirements of various technical indicators of photovoltaic backplane Many domestic manufacturers that originally produced the compound type back film also began to apply the coating type production line, and the coating type back film has become a necessary technology for the back film manufacturers At present, the related performance test and Application Research of coated back film in the industry is not perfect, including the research on the bonding performance of FEVE coated photovoltaic back film and silica gel Most of the silicone sealants used in the industry are based on the research and development of the traditional compound film, which has mature application experience in the traditional structural back film, but not in the FEVE coated back film Some of the back film and component manufacturers have encountered such problems in the application, including poor bonding performance between junction box and FEVE back film The development status of FEVE coated photovoltaic back film technology FEVE coated photovoltaic back film is mainly a coated back film which is prepared by composite coating method with pet substrate through the coating with tetrafluoroethylene copolymer resin (such as gk570) or trifluoroethylchloride copolymer resin as the main body Compared with the compound film type back film, this product does not need to use adhesive The fluorine material and pet base film have high integration degree and low cost, which realizes the light weight and film of back film FEVE fluororesin copolymerized with trifluorochloroethylene vinyl ether (such as Dalian Yongrui company: srf-350), due to the strict alternation between comonomers, makes the resin have more excellent aging resistance and is more suitable to be used as the matrix resin for photovoltaic back film coating The coated back film develops rapidly in China, but its market share is still not high, and it has not become the mainstream application in the market Based on the consideration of technological progress and environmental protection, the waterborne coating will become a new development hotspot in the next stage Domestic manufacturers are developing relevant products and have achieved preliminary results Dalian Yong Rui Fluorine Material Co., Ltd has developed two component waterborne FEVE fluorine emulsion SRF-E620 Its preparation has basically met the main performance requirements of PV backing film At present, the domestic research on the water-based photovoltaic back film is still in its infancy, and the relevant performance test, process research and market application are not perfect, so it is difficult to get commercialized application in a short time The application prospect of coated backplane due to the application time of fluorine coating in photovoltaic industry is not long enough, and the experience of case field application is not enough, so it has not become the mainstream type of backplane However, compared with other types of backplane, coated backplane has great development prospects, mainly in: (1) localization of raw material supply Fluorite film and fluorite resin are both from fluorite The reserves, production and export of fluorite resources in China rank first in the world It provides a huge advantage for the localization of fluororesin synthesis, and the domestic enterprises have reached or even surpassed the imported products in performance design and quality control of fluororesin In addition, PET raw materials have also been made in China on a large scale, which is very conducive to the cost control of coated backplane and lays a foundation for its higher cost performance As for the fluorine film type backplane, except pet, there are two other raw materials, fluorine film and adhesive, which have high requirements for process performance The domestic production technology has not made a great breakthrough, but still mainly depends on imports, so it is difficult to control the cost (2) production process controllability of performance For the fluorine film type backplane, the production process is the bonding process between fluorine film and pet The production process is simple and the technical barrier is low, so the performance of the backplane is highly dependent on the quality of raw materials, which can not be controlled by the process conditions Otherwise, the production process of coated backplane includes a series of complex chemical cross-linking reactions The reasonable design and control of production process play a decisive role in the performance of backplane Therefore, coating type backplane enterprises are more likely to adjust and improve the performance of products in time through formula and process means to ensure better reliability and more functionality [focus on WeChat official account "paint net"; pay attention to surprises, scan code to see if your husband is selling paint.. 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