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CN106206845B - A kind of fluorine film for solar cell backboard and preparation method thereof - Google Patents

A kind of fluorine film for solar cell backboard and preparation method thereof Download PDF

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CN106206845B
CN106206845B CN201610609493.8A CN201610609493A CN106206845B CN 106206845 B CN106206845 B CN 106206845B CN 201610609493 A CN201610609493 A CN 201610609493A CN 106206845 B CN106206845 B CN 106206845B
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film
fluorine film
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carbon powder
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CN106206845A (en
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张思银
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Jiangsu Fox Electric Group Co ltd
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Nanjing Xuyurui Material Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/80—Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells
    • H10F19/85—Protective back sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/16—Homopolymers or copolymers or vinylidene fluoride
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    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/16—Homopolymers or copolymers of vinylidene fluoride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2427/14—Homopolymers or copolymers of vinyl fluoride
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    • C08L2203/20—Applications use in electrical or conductive gadgets
    • C08L2203/204—Applications use in electrical or conductive gadgets use in solar cells
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Abstract

本发明公开了一种用于太阳能电池背板的氟膜及其制备方法。该氟膜包括以下原料：聚氟乙烯，聚偏氟乙烯，干冰，碳粉，桐油，聚乙烯醇缩甲醛，聚醚酰亚胺，秸秆粉，防腐剂，分散剂和流平剂。先称取原料；将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合后用干冰破碎2‑8分钟，转移至反应器中，加入秸秆粉和碳粉，加热至400‑500℃得混合物一；向混合物一种加入防腐剂和分散剂和流平剂，搅拌均匀后超声3‑8分钟得混合物二；将混合物二投入吹膜机中吹膜得成品。本发明氟膜质地均匀，耐候性好，制备方法简单，适合产业化。The invention discloses a fluorine film used for a solar battery back plate and a preparation method thereof. The fluorine film includes the following raw materials: polyvinyl fluoride, polyvinylidene fluoride, dry ice, carbon powder, tung oil, polyvinyl formal, polyetherimide, straw powder, preservative, dispersant and leveling agent. Weigh the raw materials first; mix polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil, crush with dry ice for 2-8 minutes, transfer to the reactor, add straw powder and carbon powder , heated to 400-500°C to obtain mixture 1; add preservative, dispersant and leveling agent to mixture 1, stir evenly and then ultrasonically for 3-8 minutes to obtain mixture 2; put mixture 2 into film blowing machine to blow film to obtain finished product . The fluorine film of the invention has uniform texture, good weather resistance, simple preparation method and is suitable for industrialization.

Description

一种用于太阳能电池背板的氟膜及其制备方法A kind of fluorine film for solar battery back plate and preparation method thereof

技术领域technical field

本发明涉及太阳能电池背板技术领域，具体涉及一种用于太阳能电池背板的氟膜及其制备方法。The invention relates to the technical field of solar battery backplanes, in particular to a fluorine film used for solar battery backplanes and a preparation method thereof.

背景技术Background technique

随着社会的发展，人们对能源的需求量日益增多，而化石能源又日益枯竭，迫切需要开发新兴能源。太阳能作为一种取之不尽用之不竭的能源越来越受到人们的关注。太阳能电池作为有用能源的实际应用取得了进展。太阳能电池包括各种类型，硅基太阳能电池、无机化合物基太阳能电池、有机太阳能电池等被是已知的典型太阳能电池。但由于太阳能组件长期暴露在室外，会受到环境的破坏，所以需要一层起保护作用的太阳能电池背板。所述背板具有各种优异的物理性能如耐侯性、耐水性、耐热性、水分阻隔性和气体阻隔性，以将所述太阳能电池的长期性能退化抑制到最小程度。With the development of society, people's demand for energy is increasing day by day, and fossil energy is becoming increasingly exhausted, so it is urgent to develop new energy sources. As an inexhaustible source of energy, solar energy has attracted more and more attention. Progress has been made in the practical application of solar cells as a useful energy source. The solar cells include various types, and silicon-based solar cells, inorganic compound-based solar cells, organic solar cells, and the like are known as typical solar cells. However, since the solar modules are exposed to the outdoors for a long time, they will be damaged by the environment, so a protective solar cell backsheet is needed. The back sheet has various excellent physical properties such as weather resistance, water resistance, heat resistance, moisture barrier, and gas barrier to suppress long-term performance degradation of the solar cell to a minimum.

目前，背板材料中氟材料是常用的材料，但由于氟材料属于稀缺资源，氟树脂熔点较高，难以加工，所以人们需要一种性能上替代氟材料，价格上更优惠的新材料，满足人们生产生活的需要。At present, fluorine materials are commonly used materials in backplane materials, but because fluorine materials are scarce resources, fluorine resins have a high melting point and are difficult to process, so people need a new material that can replace fluorine materials in performance and is more favorable in price to meet The needs of people's production and life.

发明内容Contents of the invention

针对现有技术的不足，本发明的目的在于提供一种用于太阳能电池背板的氟膜及其制备方法，该太阳能电池背板氟膜经久耐用，有效地保护了太阳能，且制备方法简单易行，成本低廉，适合产业化。Aiming at the deficiencies of the prior art, the object of the present invention is to provide a fluorine film for a solar battery back plate and a preparation method thereof, the fluorine film of the solar battery back plate is durable, effectively protects solar energy, and the preparation method is simple and easy OK, low cost, suitable for industrialization.

为解决现有技术问题，本发明采取的技术方案为：In order to solve the problems of the prior art, the technical scheme that the present invention takes is:

一种用于太阳能电池背板的氟膜，包括以下按重量份数计的原料，聚氟乙烯20-35份，聚偏氟乙烯40-48份，干冰0.5-0.8份，碳粉10-15份，桐油3-8份，聚乙烯醇缩甲醛20-24份，聚醚酰亚胺14-24份，秸秆粉2-8份，防腐剂0.6-1.2份，分散剂0.1-0.8份，流平剂0.5-1.3份。A fluorine film for a solar battery back plate, comprising the following raw materials in parts by weight: 20-35 parts of polyvinyl fluoride, 40-48 parts of polyvinylidene fluoride, 0.5-0.8 parts of dry ice, and 10-15 parts of carbon powder 3-8 parts of tung oil, 20-24 parts of polyvinyl formal, 14-24 parts of polyetherimide, 2-8 parts of straw powder, 0.6-1.2 parts of preservative, 0.1-0.8 parts of dispersant, flow 0.5-1.3 parts of leveling agent.

作为优选的是，上述用于太阳能电池背板的氟膜，包括以下按重量份数计的原料：聚氟乙烯20-35份，聚偏氟乙烯45份，干冰0.7份，碳粉15份，桐油3份，聚乙烯醇缩甲醛24份，聚醚酰亚胺18份，秸秆粉5份，防腐剂0.6份，分散剂0.5份，流平剂0.5份。As preferably, the above-mentioned fluorine film used for the solar battery back plate includes the following raw materials in parts by weight: 20-35 parts of polyvinyl fluoride, 45 parts of polyvinylidene fluoride, 0.7 part of dry ice, 15 parts of carbon powder, 3 parts of tung oil, 24 parts of polyvinyl formal, 18 parts of polyetherimide, 5 parts of straw powder, 0.6 part of preservative, 0.5 part of dispersant, and 0.5 part of leveling agent.

作为优选的是，所述碳粉的目数为600目。Preferably, the carbon powder has a mesh number of 600 mesh.

上述用于太阳能电池背板的氟膜的制备方法，包括以下步骤：The above-mentioned preparation method of the fluorine film used for the solar battery back plate comprises the following steps:

步骤1，按需要称取原料；Step 1, weighing raw materials as required;

步骤2，将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合后用干冰破碎2-8分钟，转移至反应器中，加入秸秆粉和碳粉，加热至400-500℃得混合物一；Step 2, mix polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil, crush with dry ice for 2-8 minutes, transfer to the reactor, add straw powder and carbon powder, heat to 400-500°C to obtain mixture one;

步骤3，向混合物一中加入防腐剂和分散剂和流平剂，搅拌均匀后超声3-8分钟得混合物二；Step 3, add preservatives, dispersants and leveling agents to mixture 1, stir evenly, and then sonicate for 3-8 minutes to obtain mixture 2;

步骤4，将混合物二投入吹膜机中吹膜得成品。Step 4, put the mixture 2 into the film blowing machine to blow the film to obtain the finished product.

作为制备方法优选的是，步骤3中超声用的波段是3000-4000Hz。As a preparation method, preferably, the wave band used for ultrasound in step 3 is 3000-4000 Hz.

作为制备方法优选的是，步骤4中吹膜机的温度是480-540℃。As a preferred preparation method, the temperature of the film blowing machine in step 4 is 480-540°C.

有益效果Beneficial effect

本发明氟膜耐候性强，耐水性强，用在太阳能电池背板上，延长了太阳能电池的使用寿命，且制备方法简单易行，产出的氟膜质地均匀，适合产业化。The fluorine film of the invention has strong weather resistance and strong water resistance, is used on the solar battery back plate, prolongs the service life of the solar battery, and has a simple and easy preparation method, and the produced fluorine film has uniform texture and is suitable for industrialization.

具体实施方式detailed description

实施例1Example 1

一种用于太阳能电池背板的氟膜，包括以下按重量份数计的原料，聚氟乙烯20份，聚偏氟乙烯40份，干冰0.5份，碳粉10份，桐油3份，聚乙烯醇缩甲醛20份，聚醚酰亚胺14份，秸秆粉2份，防腐剂0.6份，分散剂0.1份，流平剂0.5份。所述碳粉的目数为600目。A fluorine film for solar battery backplanes, comprising the following raw materials in parts by weight, 20 parts of polyvinyl fluoride, 40 parts of polyvinylidene fluoride, 0.5 parts of dry ice, 10 parts of carbon powder, 3 parts of tung oil, polyethylene 20 parts of alcohol formal, 14 parts of polyetherimide, 2 parts of straw powder, 0.6 part of preservative, 0.1 part of dispersant, and 0.5 part of leveling agent. The mesh of the carbon powder is 600 mesh.

上述用于太阳能电池背板的氟膜的制备方法，包括以下步骤：The above-mentioned preparation method of the fluorine film used for the solar battery back plate comprises the following steps:

步骤1，按需要称取原料；Step 1, weighing raw materials as required;

步骤2，将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合后用干冰破碎2-8分钟，转移至反应器中，加入秸秆粉和碳粉，加热至400-500℃得混合物一；Step 2, mix polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil, crush with dry ice for 2-8 minutes, transfer to the reactor, add straw powder and carbon powder, heat to 400-500°C to obtain mixture one;

步骤3，向混合物一中加入防腐剂和分散剂和流平剂，搅拌均匀后用波段是3000Hz超声8分钟得混合物二；Step 3, add preservatives, dispersants and leveling agents to mixture 1, stir evenly, and use a wave band of 3000Hz for 8 minutes to obtain mixture 2;

步骤4，将混合物二投入吹膜机中480℃下吹膜得成品。Step 4, put the mixture 2 into a film blowing machine and blow the film at 480°C to obtain the finished product.

实施例2Example 2

一种用于太阳能电池背板的氟膜，包括以下按重量份数计的原料，包括以下按重量份数计的原料：聚氟乙烯20-35份，聚偏氟乙烯45份，干冰0.7份，碳粉15份，桐油3份，聚乙烯醇缩甲醛24份，聚醚酰亚胺18份，秸秆粉5份，防腐剂0.6份，分散剂0.5份，流平剂0.5份。A fluorine film for a solar battery back plate, comprising the following raw materials in parts by weight: 20-35 parts of polyvinyl fluoride, 45 parts of polyvinylidene fluoride, and 0.7 parts of dry ice , 15 parts of carbon powder, 3 parts of tung oil, 24 parts of polyvinyl formal, 18 parts of polyetherimide, 5 parts of straw powder, 0.6 part of preservative, 0.5 part of dispersant, and 0.5 part of leveling agent.

所述碳粉的目数为600目。The mesh of the carbon powder is 600 mesh.

上述用于太阳能电池背板的氟膜的制备方法，包括以下步骤：The above-mentioned preparation method of the fluorine film used for the solar battery back plate comprises the following steps:

步骤1，按需要称取原料；Step 1, weighing raw materials as required;

步骤2，将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合后用干冰破碎2-8分钟，转移至反应器中，加入秸秆粉和碳粉，加热至450℃得混合物一；Step 2, mix polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil, crush with dry ice for 2-8 minutes, transfer to the reactor, add straw powder and carbon powder, heat to 450°C to obtain mixture 1;

步骤3，向混合物一中加入防腐剂和分散剂和流平剂，搅拌均匀后用波段是3500Hz超声5分钟得混合物二；Step 3, add preservatives, dispersants and leveling agents to mixture 1, stir evenly, and use a wave band of 3500 Hz for 5 minutes to obtain mixture 2;

步骤4，将混合物二投入吹膜机中500℃下吹膜得成品。Step 4, put the mixture 2 into a film blowing machine and blow the film at 500°C to obtain a finished product.

实施例3Example 3

一种用于太阳能电池背板的氟膜，包括以下按重量份数计的原料，聚氟乙烯35份，聚偏氟乙烯48份，干冰0.8份，碳粉15份，桐油3-8份，聚乙烯醇缩甲醛24份，聚醚酰亚胺24份，秸秆粉8份，防腐剂1.2份，分散剂0.8份，A fluorine film for a solar battery back plate, comprising the following raw materials in parts by weight, 35 parts of polyvinyl fluoride, 48 parts of polyvinylidene fluoride, 0.8 parts of dry ice, 15 parts of carbon powder, 3-8 parts of tung oil, 24 parts of polyvinyl formal, 24 parts of polyetherimide, 8 parts of straw powder, 1.2 parts of preservative, 0.8 parts of dispersant,

流平剂1.3份。所述碳粉的目数为600目。Leveling agent 1.3 parts. The mesh of the carbon powder is 600 mesh.

上述用于太阳能电池背板的氟膜的制备方法，包括以下步骤：The above-mentioned preparation method of the fluorine film used for the solar battery back plate comprises the following steps:

步骤1，按需要称取原料；Step 1, weighing raw materials as required;

步骤2，将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合后用干冰破碎2-8分钟，转移至反应器中，加入秸秆粉和碳粉，加热至500℃得混合物一；Step 2, mix polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil, crush with dry ice for 2-8 minutes, transfer to the reactor, add straw powder and carbon powder, heat to 500°C to obtain mixture 1;

步骤3，向混合物一中加入防腐剂和分散剂和流平剂，搅拌均匀后用波段是4000Hz超声3分钟得混合物二；Step 3, add preservatives, dispersants and leveling agents to mixture 1, stir evenly, and use 4000Hz ultrasonic wave for 3 minutes to obtain mixture 2;

步骤4，将混合物二投入吹膜机中于540℃吹膜得成品。Step 4, put the mixture 2 into the film blowing machine and blow the film at 540°C to obtain the finished product.

对比例1Comparative example 1

一种用于太阳能电池背板的氟膜，包括以下按重量份数计的原料，聚氟乙烯20-35份，聚偏氟乙烯40-48份，干冰0.5-0.8份，碳粉10-15份，桐油3-8份，聚乙烯醇缩甲醛20-24份，聚醚酰亚胺14-24份，秸秆粉2-8份，防腐剂0.6-1.2份，分散剂0.1-0.8份，流平剂0.5-1.3份。所述碳粉的目数为600目。A fluorine film for a solar battery back plate, comprising the following raw materials in parts by weight: 20-35 parts of polyvinyl fluoride, 40-48 parts of polyvinylidene fluoride, 0.5-0.8 parts of dry ice, and 10-15 parts of carbon powder 3-8 parts of tung oil, 20-24 parts of polyvinyl formal, 14-24 parts of polyetherimide, 2-8 parts of straw powder, 0.6-1.2 parts of preservative, 0.1-0.8 parts of dispersant, flow 0.5-1.3 parts of leveling agent. The mesh of the carbon powder is 600 mesh.

上述用于太阳能电池背板的氟膜的制备方法，包括以下步骤：The above-mentioned preparation method of the fluorine film used for the solar battery back plate comprises the following steps:

步骤1，按需要称取原料；Step 1, weighing raw materials as required;

步骤2，将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合转移至反应器中，加入秸秆粉和碳粉，加热至400-500℃得混合物一；Step 2, mixing and transferring polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil into a reactor, adding straw powder and carbon powder, and heating to 400-500°C to obtain a mixture 1;

步骤3，向混合物一中加入防腐剂和分散剂和流平剂，搅拌均匀后超声3-8分钟得混合物二；Step 3, add preservatives, dispersants and leveling agents to mixture 1, stir evenly, and then sonicate for 3-8 minutes to obtain mixture 2;

步骤4，将混合物二投入吹膜机中吹膜得成品。Step 4, put the mixture 2 into the film blowing machine to blow the film to obtain the finished product.

上述实施例1-3所得的氟膜相对于对比例1而言，质地均匀，耐拉伸能力强，耐候性好，有效地保护了太阳能电池，具有良好的市场前景。Compared with Comparative Example 1, the fluorine film obtained in the above-mentioned Examples 1-3 has uniform texture, strong tensile resistance, good weather resistance, effectively protects solar cells, and has a good market prospect.

Claims (6)

1.一种用于太阳能电池背板的氟膜，其特征在于，包括以下按重量份数计的原料，聚氟乙烯20-35份，聚偏氟乙烯40-48份，干冰0.5-0.8份，碳粉10-15份，桐油3-8份，聚乙烯醇缩甲醛20-24份，聚醚酰亚胺14-24份，秸秆粉2-8份，防腐剂0.6-1.2份，分散剂0.1-0.8份，流平剂0.5-1.3份。1. A fluorine film for a solar battery back plate, characterized in that it comprises the following raw materials in parts by weight, 20-35 parts of polyvinyl fluoride, 40-48 parts of polyvinylidene fluoride, 0.5-0.8 part of dry ice , 10-15 parts of carbon powder, 3-8 parts of tung oil, 20-24 parts of polyvinyl formal, 14-24 parts of polyetherimide, 2-8 parts of straw powder, 0.6-1.2 parts of preservative, dispersant 0.1-0.8 parts, 0.5-1.3 parts of leveling agent. 2.根据权利要求1所述的用于太阳能电池背板的氟膜，其特征在于，包括以下按重量份数计的原料：聚氟乙烯20-35份，聚偏氟乙烯45份，干冰0.7份，碳粉15份，桐油3份，聚乙烯醇缩甲醛24份，聚醚酰亚胺18份，秸秆粉5份，防腐剂0.6份，分散剂0.5份，流平剂0.5份。2. the fluorine film that is used for solar cell back plate according to claim 1 is characterized in that, comprises following raw material by weight: polyvinyl fluoride 20-35 parts, polyvinylidene fluoride 45 parts, dry ice 0.7 15 parts of carbon powder, 3 parts of tung oil, 24 parts of polyvinyl formal, 18 parts of polyetherimide, 5 parts of straw powder, 0.6 parts of preservative, 0.5 parts of dispersant, and 0.5 parts of leveling agent. 3.根据权利要求1所述的用于太阳能电池背板的氟膜，其特征在于，所述碳粉的目数为600目。3. The fluorine film for solar cell backsheet according to claim 1, characterized in that the carbon powder has a mesh number of 600 mesh. 4.基于权利要求1所述的用于太阳能电池背板的氟膜的制备方法，其特征在于，包括以下步骤：4. based on the preparation method of the fluorine film that is used for solar cell back plate according to claim 1, it is characterized in that, comprises the following steps: 步骤1，按需要称取原料；Step 1, weighing raw materials as required; 步骤2，将聚氟乙烯、聚偏氟乙烯、聚醚酰亚胺、聚乙烯醇缩甲醛和桐油混合后用干冰破碎2-8分钟，转移至反应器中，加入秸秆粉和碳粉，加热至400-500℃得混合物一；Step 2, mix polyvinyl fluoride, polyvinylidene fluoride, polyetherimide, polyvinyl formal and tung oil, crush with dry ice for 2-8 minutes, transfer to the reactor, add straw powder and carbon powder, heat to 400-500°C to obtain mixture one; 步骤3，向混合物一中加入防腐剂和分散剂和流平剂，搅拌均匀后超声3-8分钟得混合物二；Step 3, add preservatives, dispersants and leveling agents to mixture 1, stir evenly, and then sonicate for 3-8 minutes to obtain mixture 2; 步骤4，将混合物二投入吹膜机中吹膜得成品。Step 4, put the mixture 2 into the film blowing machine to blow the film to obtain the finished product. 5.根据权利要求4所述的用于太阳能电池背板的氟膜的制备方法，其特征在于：步骤3中超声用的波段是3000-4000Hz。5 . The method for preparing a fluorine film for a solar battery back plate according to claim 4 , wherein the wave band for ultrasound in step 3 is 3000-4000 Hz. 6.根据权利要求4所述的用于太阳能电池背板的氟膜的制备方法，其特征在于：步骤4中吹膜机的温度是480-540℃。6 . The method for preparing a fluorine film for solar battery back sheets according to claim 4 , wherein the temperature of the film blowing machine in step 4 is 480-540° C.
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