CN102015295A - 多层三元离聚物包封层以及包含它们的太阳能电池层压板 - Google Patents

多层三元离聚物包封层以及包含它们的太阳能电池层压板 Download PDF

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CN102015295A
CN102015295A CN2008801161785A CN200880116178A CN102015295A CN 102015295 A CN102015295 A CN 102015295A CN 2008801161785 A CN2008801161785 A CN 2008801161785A CN 200880116178 A CN200880116178 A CN 200880116178A CN 102015295 A CN102015295 A CN 102015295A
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sub
assembly
sheet material
solar cell
ternary ionomer
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CN102015295B (zh
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R·A·海斯
J·凯普尔
S·L·萨米尔斯
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Dow Chemical Co
Dow Global Technologies LLC
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EI Du Pont de Nemours and Co
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Abstract

本发明公开了太阳能电池预层压组合件,所述太阳能电池预层压组合件包括三元离聚物多层膜或片材和由几个电互连的太阳能电池形成的太阳能电池组件。该三元离聚物多层膜或片材包括第一表面亚层、第二表面亚层和夹置在第一表面亚层和第二表面亚层之间的至少一个任选的内亚层。第一表面亚层包含三元离聚物。第二表面亚层和/或至少一个任选的内亚层包含高熔点聚合物。

Description

多层三元离聚物包封层以及包含它们的太阳能电池层压板
本发明涉及包含三元离聚物的多层包封膜或片材,以及包含它们的太阳能电池层压板。
发明背景
作为一种可持续性的能源,太阳能电池模块的应用范围正迅速扩大。制造太阳能电池模块的一种优选方式涉及形成包括至少5个结构层的预层压组合件。太阳能电池预层压组合件按以下从顶层或入射层(即,与光最先接触的层)开始,并且延续到背衬(离入射层最远的层)的顺序进行构造:(1)入射层(通常为玻璃板或聚合物膜(诸如含氟聚合物或聚酯膜),但可能为能透射太阳光的任何材料),(2)前包封层,(3)太阳能电池组件,(4)后包封层,和(5)背衬层。
包封层被设计用于包封并保护易碎的太阳能电池组件。一般来讲,太阳能电池预层压组合件包括至少两个夹持太阳能电池组件的包封层。适合用于太阳能电池包封层中的聚合物材料将通常具有多种特性的组合,例如高透明性、低雾度、高抗冲击性、高耐穿透性、优异的耐紫外线性能、良好的长期热稳定性、与玻璃和其他刚性聚合物片材之间的充足粘附强度、高防潮性、以及优异的长期耐候性。此外,前包封层的光学特性可使得光能够被有效地透射至太阳能电池组件。
离聚物在太阳能电池包封层中的用途已在例如美国专利5,476,553、5,478,402、5,733,382、5,762,720、5,986,203、6,114,046、6,187,448和6,660,930,美国专利申请2003/0000568、2005/0279401、2006/0084763和2006/0165929,以及日本专利JP 2000186114和JP 2006032308中有所公开,其中该离聚物衍生自α-烯烃和α,α-烯键式不饱和羧酸的部分地中和或全部中和的酸性共聚物。类似的离聚物组合物也已用作安全玻璃夹层(参见例如美国专利3,344,014、3,762,988、4,663,228、4,668,574、4,799,346、5,759,698、5,763,062、5,895,721、6,150,028、6,432,522,美国专利申请2002/0155302和2002/0155302,以及PCT申请WO 99/58334和WO 2006/057771)。
三元离聚物也已用于形成太阳能电池包封层(参见例如美国专利申请2006/0165929和日本专利JP 2006032308),其中该三元离聚物衍生自α-烯烃、α,β-烯键式不饱和羧酸和α,β-烯键式不饱和羧酸酯的部分地中和或全部中和的酸性三元共聚物。类似的三元离聚物组合物也已用作安全玻璃夹层(参见美国专利3,344,014和5,759,698,以及美国专利申请2007/0154694)。
然而,由此类离聚物制成的太阳能电池包封层通常无法向太阳能电池组件提供足够的抗冲击保护。此外,低透光率以及与其他层压板层的弱粘合力也会阻碍此类离聚物在太阳能电池包封层中的使用,尤其是在苛刻环境老化后更是如此。另一方面,除了透光率低以及与其他层压层的粘合力弱之外,低耐热性能与衍生自三元离聚物的太阳能电池包封层有关系,因为该三元离聚物的熔点低。
需要适合用作太阳能电池包封层的聚合物膜或片材,所述薄膜或片材是透明的、与其他层压层高度粘合,并且是耐湿和耐热的。
发明概述
本发明涉及太阳能电池预层压组合件,该预层压组合件包括三元离聚物多层膜或片材和由一个或多个电互连的太阳能电池形成的太阳能电池组件,其中(i)该太阳能电池组件具有面向光源的受光面和背离光源的背面;(ii)该三元离聚物多层膜或片材包括第一表面亚层、第二表面亚层和夹置在第一表面亚层和第二表面亚层之间的任选一个或多个内亚层;(iii)该三元离聚物多层膜或片材的第一表面亚层包含三元离聚物;(iv)该三元离聚物多层膜或片材的第二表面亚层、该三元离聚物多层膜或片材的至少一个任选的内亚层或两者包含高熔点聚合物;(v)该三元离聚物衍生自酸性三元共聚物,所述酸性三元共聚物按酸性三元共聚物的总羧酸含量计约5%至约90%用一种或多种金属离子进行中和,并且该三元离聚物包含重复单元,所述重复单元衍生自α-烯烃、按该酸性三元共聚物的总重量计约5至约15重量%的具有3至8个碳的α,β-烯键式不饱和羧酸、以及约15至约40重量%的具有4至12个碳的α,β-烯键式不饱和羧酸酯;并且(vi)该高熔点聚合物具有至少约80℃的熔点。
本发明还涉及包括如下步骤的方法:(i)提供如上所述的太阳能电池预层压组合件,以及(ii)层压该组合件以形成太阳能电池模块。
本发明还涉及通过层压如上所述的太阳能电池预层压组合件制备的太阳能电池模块。
发明详述
术语“酸性共聚物”是指由衍生自α-烯烃、α,β-烯键式不饱和羧酸和任选地其他适宜的共聚单体诸如α,β-烯键式不饱和羧酸酯的共聚单元组成的聚合物。
术语“酸性三元共聚物”是指一类酸性共聚物,该酸性共聚物包含衍生自α-烯烃、α,β-烯键式不饱和羧酸、和α,β-烯键式不饱和羧酸酯的共聚单元。
术语“离聚物”是指通过将如上所公开的母体酸性共聚物部分地或完全地中和而衍生自所述母体酸性共聚物的聚合物。
术语“三元离聚物”是指一类离聚物,其衍生自如上所述的母体酸性三元共聚物。
三元离聚物多层膜和片材
三元离聚物多层聚合物膜或片材具有两个或更多个亚层,其中至少一个表面亚层由三元离聚物组合物制成,并且其中三元离聚物衍生自母体酸性三元共聚物,该三元共聚物包含重复单元,所述重复单元衍生自具有2至10个碳的α-烯烃、按酸性三元共聚物的总重量计约5至约15重量%的具有3至8个碳的α,β-烯键式不饱和羧酸、和约15至约40重量%的具有4至12个碳的α,β-烯键式不饱和羧酸酯,并且该酸性三元共聚物按该酸三元共聚物的总羧酸含量计约5%至约90%用金属离子中和。术语“表面亚层”是指形成三元离聚物多层膜或片材的两个外表面的两个亚层。此外,所述三元离聚物多层膜或片材还包括至少一个由熔点为约80℃或更高的聚合物组合物形成的亚层,优选内亚层。术语“内亚层”是指位于两个表面亚层之间的亚层。当为双层形式时,所述三元离聚物多层膜或片材包括含有三元离聚物组合物的第一亚层和含有高熔点聚合物组合物的第二亚层。此外,当所述多层膜或片材具有三个或更多个亚层时,优选两个表面亚层中的至少一个由三元离聚物组合物形成,或更优选两个表面亚层均由三元离聚物组合物形成,并且至少一个其他亚层,或更优选至少一个内亚层由高熔点聚合物组合物形成。多层膜或片材的其他亚层可由任何其他合适的聚合物组合物制成。示例性的适宜的聚合物组合物可包括聚合物材料,该聚合物材料选自酸性共聚物、离聚物、乙烯-乙酸乙烯酯共聚物、聚(乙烯醇缩醛)(例如聚(乙烯缩丁醛))、热塑性聚氨酯、聚(氯乙烯)、聚乙烯(例如茂金属催化的线性低密度聚乙烯)、聚烯烃嵌段弹性体、α-烯烃与α,β-烯键式不饱和羧酸酯的共聚物(例如乙烯-丙烯酸甲酯共聚物和乙烯-丙烯酸丁酯共聚物)、硅氧烷弹性体、环氧树脂、以及它们中的两种或更多种的混合物。
所述母体酸性三元共聚物优选包含按所述酸性三元共聚物的总重量计约7至约11重量%,或约9重量%的α,β-烯键式不饱和羧酸的重复单元,以及约20至约30重量%,或约23至约24重量%的α,β-烯键式不饱和羧酸酯的重复单元。
所述α-烯烃共聚单体可包括但不限于乙烯、丙烯、1-丁烯、1-戊烯、1-己烯、1-庚烯、3-甲基-1-丁烯、4-甲基-1-戊烯等、以及它们中的两种或更多种的混合物。优选地,所述α-烯烃为乙烯。
所述α,β-烯键式不饱和羧酸共聚单体可包括但不限于丙烯酸、甲基丙烯酸、衣康酸、马来酸、马来酸酐、富马酸、一甲基马来酸、以及它们中的两种或更多种的混合物。优选地,所述α,β-烯键式不饱和羧酸选自丙烯酸、甲基丙烯酸、以及它们中的两种或更多种的混合物。
所述α,β-烯键式不饱和羧酸酯共聚单体可包括但不限于丙烯酸甲酯、甲基丙烯酸甲酯、丙烯酸乙酯、甲基丙烯酸乙酯、丙烯酸异丙酯、甲基丙烯酸异丙酯、丙烯酸丁酯、甲基丙烯酸丁酯、以及它们中的两种或更多种的混合物。优选地,所述α,β-烯键式不饱和羧酸酯选自丙烯酸甲酯和丙烯酸丁酯。
母体酸性三元共聚物可按照美国专利3,404,134、5,028,674、6,500,888和6,518,365中所述进行共聚。
为了获得三离共聚物,可用金属离子中和按母体酸性三元共聚物的羧酸总含量计约10%至约50%、或约20%至约40%的母体酸性三元共聚物。金属离子可以是一价的、二价的、三价的、多价的、或它们的混合形式。可用的一价金属离子包括但不限于钠、钾、锂、银、汞、铜、以及它们中的两种或更多种的混合物。可用的二价金属离子包括但不限于铍、镁、钙、锶、钡、铜、镉、汞、锡、铅、铁、钴、镍、锌、以及它们中的两种或更多种的混合物。可用的三价金属离子包括但不限于铝、钪、铁、钇、以及它们中的两种或更多种的混合物。可用的多价金属离子包括但不限于钛、锆、铪、钒、钽、钨、铬、铈、铁、以及它们中的两种或更多种的混合物。需要注意的是,当金属离子为多价时,可包含络合剂,例如硬脂酸盐、油酸盐、水杨酸盐和苯酚盐基团,如美国专利3,404,134中所公开的。优选地,金属离子选自钠、锂、镁、锌、以及它们中的两种或更多种的混合物。更优选地,金属离子选自钠、锌、以及它们的混合物。最优选地,金属离子为锌。母体酸性三元共聚物可按美国专利3,404,134中所公开的方法进行中和。
三元离聚物的一个优选实例衍生自乙烯与丙烯酸丁酯与甲基丙烯酸的聚合物,其中约20%至约40%的甲基丙烯酸用锌离子中和。
所述高熔点聚合物组合物优选具有至少约90℃,或至少约95℃的熔点。
更优选地,所述高熔点聚合物组合物包含选自下列的聚合物:酸性共聚物、离聚物、乙烯-乙酸乙烯酯共聚物、热塑性聚氨酯、聚(氯乙烯)、聚乙烯、α-烯烃与α,β-烯键式不饱和羧酸酯的共聚物(例如乙烯-丙烯酸甲酯共聚物和乙烯-丙烯酸丁酯共聚物)、聚酯(例如PETG非晶形聚酯(Eastman Chemical Company,Kingsport,TN))、和环氧树脂。优选地,所述高熔点聚合物组合物包含选自酸性共聚物和离聚物的聚合物。
并且更优选地,所述高熔点聚合物组合物包含衍生自酸性共聚物的离聚物,该酸性共聚物包含α-烯烃和α,β-烯键式不饱和羧酸的共聚单元,并且按该酸性共聚物的总羧酸含量计,所述酸性共聚物的约1%至约90%、或约10%至约40%用金属离子中和,如制备三元离聚物中所述。优选地,金属离子选自钠、锌、镁、和锂。本文用于中和酸性共聚物的最优选的金属离子是锌。离聚物组合物的具体实例包括那些得自E.I.du Pont deNemours and Company(Wilmington,DE)(DuPont)的Surlyn产品。
所述聚合物组合物还可包含本领域已知的任何适宜的添加剂,包括增塑剂、加工助剂、润滑剂、阻燃剂、抗冲改性剂、成核剂、抗粘连剂(例如二氧化硅)、热稳定剂、紫外线吸收剂、紫外线稳定剂、分散剂、表面活性剂、螯合剂、偶联剂、粘合剂、底漆、或它们中的两种或更多种的混合物。包含在所述组合物中的添加剂的总量按所述组合物的总重量计为约0.001至最多约5重量%。
所述三元离聚物组合物还任选包含一种或多种硅烷偶联剂以进一步增加含有所述一种或多种硅烷偶联剂的多层膜或片材的粘附强度。示例性的偶联剂包括但不限于γ-氯丙基甲氧基硅烷、乙烯基三甲氧基硅烷、乙烯基三乙氧基硅烷、乙烯基三(β-甲氧基乙氧基)硅烷、γ-乙烯基苄基丙基三甲氧基硅烷、N-β-(N-乙烯基苄基氨基乙基)-γ-氨基丙基三甲氧基硅烷、γ-甲基丙烯酰氧基丙基三甲氧基硅烷、乙烯基三乙酰氧基硅烷、γ-环氧丙氧丙基三甲氧基硅烷、γ-环氧丙氧丙基三乙氧基硅烷、β-(3,4-环氧环己基)乙基三甲氧基硅烷、乙烯基三氯硅烷、γ-巯丙基甲氧基硅烷、γ-氨基丙基三乙氧基硅烷、N-β-(氨基乙基)-γ-氨基丙基三甲氧基硅烷、以及它们中的两种或更多种的混合物。硅烷偶联剂在三元离聚物组合物中的含量按该组合物的总重量计优选为约0.01至约5重量%,或约0.05至约1重量%。然而更优选地,该三元离聚物组合物不包含任何粘合性促进剂,例如上述硅烷偶联剂。
高熔点聚合物组合物还任选包含添加剂以将树脂的熔融流动性降低至可在层压期间使由其获得的薄膜或片材热固的范围内,从而使包含它们的层压制品具有甚至更大热阻和耐火性。通过加入此类添加剂可将最终使用温度升高约20℃至约70℃。有效降低熔融流动性的添加剂通常为有机过氧化物,诸如2,5-二甲基己烷-2,5-二氢过氧化物、2,5-二甲基-2,5-二(叔丁基过氧)己烷-3、二叔丁基过氧化物、过氧化叔丁基异丙苯、2,5-二甲基-2,5-二(叔丁基过氧)己烷、过氧化二异丙苯、α,α’-双(叔丁基过氧异丙基)苯、4,4-双(叔丁基过氧)戊酸正丁酯、2,2-双(叔丁基过氧)丁烷、1,1-双(叔丁基过氧)环己烷、1,1-双(叔丁基过氧)-3,3,5-三甲基环己烷、过氧苯甲酸叔丁酯、过氧化苯甲酰等、以及它们中的两种或更多种的组合。有机过氧化物在约100℃或更高温度下可分解生成基团,或具有分解温度,该分解温度在约70℃或更高温度下提供10小时的半衰期以提高共混操作的稳定性。加入的有机过氧化物量按所述组合物的总重量计为约0.01至约10重量%,或约0.5至约3.0重量%。
如果需要,三元离聚物组合物中可包含引发剂例如二月桂酸二丁基锡,所述引发剂的量按所述组合物的总重量计为约0.01至约0.05重量%。此外,如果需要,可将抑制剂例如对苯二酚、对苯二酚一甲基醚、对苯醌和甲基氢醌加入到所述三元离聚物组合物中,所述抑制剂的量按所述组合物的总重量计小于约5重量%。
三元离聚物组合物或高熔点聚合物组合物也可以不包含上述降低流动性的添加剂,以使整个多层片材具有热塑性并且能够回收利用。
每个包含三元离聚物的表面亚层可具有约0.5密耳(0.013mm)至约5密耳(0.13mm)、或约0.5密耳至约3密耳(0.076mm)的厚度,并且每个包含高熔点聚合物的内亚层可具有约0.5密耳(0.013mm)至约19密耳(0.48mm)、或约1密耳(0.025mm)至约15密耳(0.38mm)、或约2密耳(0.051mm)至约10密耳(0.25mm)的厚度。多层膜或片材的总厚度可在约2密耳(0.051mm)至约20密耳(0.51mm)的范围内。
当三元离聚物多层膜或片材被作为包封层膜包括在柔性太阳能电池层压板中时,它优选具有约2密耳(0.051mm)至约10密耳(0.25mm)、或约2密耳(0.051mm)至约5密耳(0.13mm)的厚度。当三元离聚物多层膜或片材被作为包封层膜包括在刚性太阳能电池层压板中时,它优选具有约10密耳(0.25mm)至约20密耳((0.51mm)的厚度。三元离聚物多层膜和片材可具有满足其所结合的太阳能电池模块需要的任何厚度。
所述三元离聚物多层膜或片材在一侧或两侧上可具有平滑或粗糙的表面。所述多层膜或片材优选在两侧上具有粗糙的表面以在层压加工期间有利于层压板脱气。粗糙表面可通过以下方式制得:在多层膜或片材挤出期间进行机械压花或熔融破裂,然后骤冷,以便粗糙度在处理期间保留下来。可通过本领域的常用方法向三元离聚物多层膜或片材施加表面图案。例如,可让刚挤出的多层膜或片材从模辊的特制表面上通过,模辊紧邻模具的出口布置,该特制表面向熔融聚合物的一侧赋予所需的表面特性。因此,当该模辊的表面具有微小的峰和谷时,浇铸在其上的聚合物膜或片材在与辊接触的一侧上将具有粗糙表面,该粗糙表面一般分别适形于辊表面的谷和峰。此类模辊在例如2007年3月20日提交的美国专利4,035,549、美国专利申请2003/0124296、以及美国专利申请11/725,622中有所公开。
根据ASTM D1003所测,该三元离聚物多层膜或片材具有约80%至约100%的透光百分率。优选地,三元离聚物多层膜或片材具有约90%至约100%的透光百分率。此外,根据ASTM D1003所测,它有利地提供约90%至100%、或约95%至100%、或约98%至100%的清晰度百分率。
所述三元离聚物多层膜或片材可由任何适宜的工艺制得。例如,所述多层膜或片材可通过以下方法制得:浸涂、溶液浇铸、压塑、注塑、层压、熔融挤出、吹塑薄膜、挤压涂布、串联挤压涂布、或本领域技术人员已知的任何其他方法。优选地,多层膜或片材由熔融共挤出、熔融挤出涂布、或串联熔融挤出涂布工艺制得。
层压板
本发明还提供太阳能电池预层压组合件,该太阳能电池预层压组合件包括至少一层三元离聚物多层膜或片材和由其产生的太阳能电池模块。
电池模块中使用此类三元离聚物多层膜或片材可提供比其他现有技术离聚物或三元离聚物膜或片材更多的优点。首先,该三元离聚物多层膜或片材具有增强的透明性。第二,与现有技术离聚物片材或膜相比,该三元离聚物多层膜或片材与其他层压层(例如玻璃)的粘附强度更好,尤其是在苛刻环境老化后,诸如在高温(例如约75℃或更高)和高湿度(例如相对湿度为约85%或更高)条件下保持较长的一段时间(例如约750小时或更长)后。(参见例如表3)。第三,将高熔点聚合物加入到多层膜或片材中可进一步提供改进的热阻。
太阳能电池预层压组合件包括由一个或多个太阳能电池构成的太阳能电池组件,以及至少一层上述三元离聚物多层膜或片材。
太阳能电池旨在包括能将光转换成电能的任何制品。各种形式的太阳能电池的典型领域实例包括例如单晶硅太阳能电池、多晶硅太阳能电池、微晶硅太阳能电池、非晶硅太阳能电池、铜铟硒化物太阳能电池、化合物半导体太阳能电池、染料敏化太阳能电池等。最常见的太阳能电池类型包括多晶太阳能电池、薄膜太阳能电池、化合物半导体太阳能电池和非晶硅太阳能电池。
薄膜太阳能电池可通过将若干薄膜层沉积到基底例如玻璃或柔性薄膜上来制备,其中各层被图案化,从而形成多个单个电池,这些单个电池电互连在一起以提供合适的电压输出。根据多层沉积进行的顺序,基底可以充当太阳能电池模块的后表面或前窗口。作为举例,薄膜太阳能电池在美国专利5,512,107、5,948,176、5,994,163、6,040,521、6,137,048、和6,258,620中有所公开。
所述太阳能电池预层压组合件可包括至少一层三元离聚物多层膜或片材,所述三元离聚物多层膜或片材位于太阳能电池组件附近并且用作一个包封层,或优选地所述三元离聚物多层膜或片材位于与太阳能电池组件相邻的受光侧面上并且用作前包封层。
所述太阳能电池预层压组合件还可包括由其他聚合材料制成的包封层,所述聚合材料如酸性共聚物、离聚物、乙烯乙酸乙烯酯、聚(乙烯醇缩醛)(包括隔音级聚(乙烯醇缩醛))、聚氨酯、聚氯乙烯、聚乙烯(例如线性低密度聚乙烯)、聚烯烃嵌段弹性体、α-烯烃与α,β-烯键式不饱和羧酸酯的共聚物(例如乙烯-丙烯酸甲酯共聚物和乙烯-丙烯酸丁酯共聚物)、硅氧烷弹性体、环氧树脂、以及它们中的两种或更多种的组合。所述太阳能电池预层压组合件优选包括两层三元离聚物多层膜或片材,其中两层三元离聚物多层膜或片材中的每一层被分别层压到太阳能电池组件的两侧上,并且用作前包封层和后包封层。
不同于多层膜或片材的单独包封层的厚度可独立地在约1密耳(0.026mm)至约120密耳(3mm),或约1密耳至约40密耳(1.02mm),或约1密耳至约20密耳(0.51mm)的范围内。包括在太阳能电池预层压组合件中的所有包封层可具有平滑或粗糙的表面。优选地,所述包封层具有粗糙的表面以有利于通过层压过程脱去层压板的空气。
所述太阳能电池预层压组合件还可包括入射层和/或背衬层,它们分别用作受光面和背光面上的组合件的外层。
所述太阳能电池预层压组合件的外层即入射层和背衬层可得自任何适宜的片材或薄膜。适合的片材可以是玻璃或塑性片材,诸如聚碳酸酯、丙烯酸类、聚丙烯酸酯、环状聚烯烃(例如乙烯降冰片烯聚合物)、聚苯乙烯(优选茂金属催化的聚苯乙烯)、聚酰胺、聚酯、含氟聚合物等等、以及它们中的两种或更多种的组合。此外,可以利用金属片材诸如铝、钢、镀锌钢或陶瓷板来形成所述背衬层。
术语“玻璃”不仅包括窗玻璃、玻璃板、硅酸盐玻璃、玻璃片、低铁玻璃、钢化玻璃、钢化无氧化铈玻璃、和浮法玻璃,而且还包括彩色玻璃、特种玻璃(例如,那些含有控制例如太阳能加热的成分的玻璃)、镀膜玻璃(例如,那些为控制太阳能而溅射金属(例如,银或铟氧化锡)的玻璃)、E-玻璃、Toroglass、Solex
Figure GPA00001137998700101
玻璃(PPG Industries,Pittsburgh,PA)和Starphire
Figure GPA00001137998700102
玻璃(PPG Industries)。此类特种玻璃在例如美国专利4,615,989、5,173,212、5,264,286、6,150,028、6,340,646、6,461,736、和6,468,934中有所公开。然而应当理解的是,应根据预期用途为具体的层压板选择玻璃类型。
适用的薄膜层可以是聚合物,所述聚合物包括但不限于聚酯(例如聚(对苯二甲酸乙二醇酯)和聚(萘二甲酸乙二醇酯))、聚碳酸酯、聚烯烃(例如聚丙烯、聚乙烯和环状聚烯烃)、降冰片烯聚合物、聚苯乙烯(例如间规聚苯乙烯)、苯乙烯-丙烯酸酯共聚物、丙烯腈-苯乙烯共聚物、聚砜(例如聚醚砜、聚砜等)、尼龙、聚氨酯、丙烯酸类、乙酸纤维素(例如乙酸纤维素、三乙酸纤维素等)、玻璃纸、聚(氯乙烯)(例如聚(偏二氯乙烯))、含氟聚合物(例如,聚氟乙烯、聚偏氟乙烯、聚四氟乙烯、乙烯-四氟乙烯共聚物等)、或它们中的两种或更多种的组合。所述聚合物膜可为双轴向取向的聚酯膜(优选聚(对苯二甲酸乙二醇酯)薄膜)或含氟聚合物膜(例如得自DuPont的Tedlar
Figure GPA00001137998700103
、Tefzel
Figure GPA00001137998700104
、和Teflon薄膜)。对某些应用而言,含氟聚合物-聚酯-含氟聚合物(TPT)薄膜也是优选的。金属薄膜诸如铝箔也可用作背衬片材。
所述太阳能电池预层压组合件还可包含嵌入在所述组合件中的其他功能性薄膜或片材层(例如介电层或阻挡层)。此类功能性层可得自任何上述聚合物膜,或涂覆有其他功能性涂层的那些。例如,涂覆有金属氧化物涂层的聚对苯二甲酸乙二醇酯薄膜(例如美国专利6,521,825和6,818,819以及EP1182710中所公开的那些)可充当层压板内的氧气和水分阻挡层。
如果需要,包括在太阳能电池层压板内的入射层膜和片材、背衬层膜和片材、三元离聚物多层膜或片材以及其他层的一个或两个表面可经过处理以增强与其他层压层的粘附力。该粘合性强化处理可采用本领域中已知的任何形式,并包括火焰处理(参见例如美国专利2,632,921、2,648,097、2,683,894、和2,704,382)、等离子处理(参见例如US4,732,814)、电子束处理、氧化处理、电晕放电处理、化学处理、铬酸处理、热空气处理、臭氧处理、紫外线处理、喷砂处理、溶剂处理、以及它们中的两种或更多种的组合。还可通过将粘合剂或底漆涂层施用在层压层表面上来进一步改善粘附强度。例如,美国专利4,865,711公开了具有改善的可粘结性的薄膜或片材,其具有沉积在一个或两个表面上的碳薄层。其他示例性粘合剂或底漆可包括硅烷、基于聚(烯丙胺)的底漆(参见例如美国专利5,411,845、5,770,312、5,690,994、和5,698,329)、以及基于丙烯酸的底漆(参见例如US 5,415,942)。粘合剂或底漆涂层可采用该粘合剂或底漆的单层形式,并具有约0.0004至约1密耳(约0.00001至约约0.03mm)、或优选地约0.004至约0.5密耳(约0.0001至约0.013mm)、或更优选地约0.004至约0.1密耳(约0.0001至约0.003mm)的厚度。
如果需要,还可在所述太阳能电池层压板中包含一层非织造玻璃纤维(稀松布)以有利于在层压过程期间排气或用作包封层的加固物。在例如美国专利5,583,057、6,075,202、6,204,443、6,320,115、6,323,416、以及EP0769818中公开了此类稀松布层在太阳能电池层压板中的使用。
位于所述太阳能电池组件受光面的薄膜或片材层可由透明材料制得,以使太阳光能够有效地透射到太阳能电池组件中。可包含特殊的薄膜或片材以起到包封层和外层的作用。包括在组合件中的任何薄膜或片材层可采用预成形的单层或多层膜或片材的形式。
如果需要,可如上所述处理太阳能电池预层压组合件层压层的一个或两个表面以增强粘附强度。
所述三元离聚物多层膜和片材优选不经过任何粘合性强化处理,并且自身可与其他层压层粘合。
所述太阳能电池预层压组合件可采用本领域内已知的任何形式。优选的具体太阳能电池预层压构造(顶(受光)面至背面)包括:
玻璃/TI/太阳能电池/TI/玻璃;
玻璃/TI/太阳能电池/TI/含氟聚合物膜(例如Tedlar
Figure GPA00001137998700121
薄膜);
含氟聚合物膜/TI/太阳能电池/TI/玻璃;
含氟聚合物膜/TI/太阳能电池/TI/含氟聚合物膜;
玻璃/TI/太阳能电池/TI/聚酯膜(例如聚(对苯二甲酸乙二醇酯)薄膜);
含氟聚合物膜/TI/太阳能电池/TI/聚酯膜;
玻璃/TI/太阳能电池/TI/涂布阻挡材料的薄膜/TI/玻璃;
含氟聚合物膜/TI/涂布阻挡材料的薄膜/TI/太阳能电池/TI/涂布阻挡材料的薄膜/TI/含氟聚合物膜;
玻璃/TI/太阳能电池/TI/铝板锭;
含氟聚合物膜/TI/太阳能电池/TI/铝板锭;
玻璃/TI/太阳能电池/TI/镀锌钢片;
玻璃/TI/太阳能电池/TI/聚酯膜/TI/铝板锭;
含氟聚合物膜/TI/太阳能电池/TI/聚酯膜/TI/铝板锭;
玻璃/TI/太阳能电池/TI/聚酯膜/TI/镀锌钢片;
含氟聚合物膜/TI/太阳能电池/TI/聚酯膜/TI/镀锌钢片;
玻璃/TI/太阳能电池/聚(乙烯醇缩丁醛)包封层/玻璃;
玻璃/TI/太阳能电池/聚(乙烯醇缩丁醛)包封层/含氟聚合物膜;
含氟聚合物膜/TI/太阳能电池/酸性共聚物包封层/含氟聚合物膜;
玻璃/TI/太阳能电池/乙烯乙酸乙烯酯包封层/聚酯膜;
含氟聚合物膜/TI/太阳能电池/乙烯-丙烯酸甲酯共聚物包封层/聚酯膜;
玻璃/乙烯-丙烯酸丁酯共聚物包封层/太阳能电池/TI/涂布阻挡材料的薄膜/乙烯-丙烯酸丁酯共聚物包封层/玻璃;
等等,其中“TI”代表三元离聚物多层膜或片材。此外,除了得自DuPont的Tedlar
Figure GPA00001137998700122
薄膜以外,适宜的含氟聚合物膜也包括TPT三层膜。
本发明还提供由上文所公开的太阳能电池预层压组合件制得的太阳能电池层压板。具体地讲,通过使太阳能电池预层压组合件经受下面详细提供的进一步层压处理而形成太阳能电池层压板。
层压方法
可使用本领域内已知的任何层压方法由太阳能电池预层压组合件来制备太阳能电池层压板。层压方法可以为高压釜法或非热压法。
在示例性方法中,将预层压太阳能电池组合件的组件层以所需的次序堆叠以形成预层压组合件。然后将所述组合件置于能够承受真空的袋(真空袋)中,通过真空管线或其他装置将所述袋中的空气排出,将所述袋密封同时保持真空(例如约27-28in Hg(689-711mmHg)),并且将密封袋在压力为150至约250psi(约11.3-18.8巴),温度为约130℃至约180℃,或约120℃至约160℃,或约135℃至约160℃,或约145℃至约155℃的高压釜中放置或约10至约50分钟,或约20至约45分钟,或约20至约40分钟,或约25至约35分钟。可以用真空环来代替真空袋。美国专利3,311,517中公开了一类合适的真空袋。加热和加压循环后,使高压釜中的空气冷却,但不加入额外的气体以保持高压釜内的压力。冷却约20分钟之后,释放掉多余的空气压力,并从高压釜中取出层压板。
作为另外一种选择,可将所述预层压组合件在约80℃至约120℃,或约90℃至约100℃的烘箱中加热约20至约40分钟,之后使热组合件通过一组咬送辊以使单层间空隙空间中的空气被挤出,并且所述组合件的边缘密封。本阶段的组合件称为预压件。
然后将预压件放入到空气高压釜中,在约100至约300psi(约6.9至约20.7巴),或约200psi(13.8巴)的压力下,将高压釜中的温度升至约120℃至约160℃,或约135℃至约160℃。将这些条件保持约15至约60分钟,或约20至约50分钟,然后使空气冷却,而不将额外的空气加入到高压釜中。冷却约20至约40分钟之后,释放掉多余的空气压力,并从高压釜中取出层压产品。
通过非热压方法,也可制得太阳能电池层压板。此类非热压方法公开于例如美国专利3234062、3852136、4341576、4385951、4398979、5536347、5853516、6342116、5415909;美国专利申请2004/0182493;欧洲专利EP1235683B1;以及PCT专利申请WO91/01880和WO03/057478A1中。一般来讲,非热压方法包括加热预压组合件并且施加真空、压力或二者。例如可使组合件依次通过加热烘箱和咬送辊。
可使用基本上任何层压方法。
实施例
下列实施例和比较实施例旨在举例说明本发明,并不旨在以任何方式限制本发明的范围。
熔融指数
使用2160g的负荷在190℃下按照ASTM D1238测量熔融指数(MI)。
熔点
按照差示扫描量热法(DSC)测定熔点。
层压方法1
将层压组件层堆叠形成预层压组合件。就包含聚合物膜层作为外表面层的组合件而言,将玻璃覆盖片材放置在薄膜层上方。然后将预层压组合件放入到Meier ICOLAM
Figure GPA00001137998700141
10/08层压机(Meier层压机(;MeierVakuumtechnik GmbH,Bocholt,Germany)中。层压循环包括5.5分钟的排空步骤(3inHg(76mmHg)真空)和145℃温度下5.5分钟加压步骤(1000毫巴压力)。然后将所得层压板从层压机中取出。
层压方法2
将层压组件层堆叠形成预层压组合件。就包含聚合物膜层作为外表面层的组合件而言,将玻璃覆盖片材放置在薄膜层上方。然后将该预层压组合件放入真空袋内,将真空袋密封,并通过施加真空来除去真空袋内的空气。将真空袋放入烘箱内,并且在约90℃至约100℃下加热30分钟,以除去包含在组合件之间的任何空气。然后在加压至200psig(14.3巴)的空气高压釜中,使所述组合件在140℃下热压30分钟。将空气冷却,并且不将额外的空气加入到所述高压釜中。冷却20分钟之后,并且当空气温度低于约50℃时,释放多余压力,并且将所得层压板从高压釜中取出。
材料
下列薄膜和片材用于实施例中:
·AL为3.2mm厚的铝片材,其为与2.5重量%镁铸合的5052铝片材,并且符合美国联邦规范QQ-A-250/8和ASTM B209;
·EVA为SC50B,据信其为基于乙烯-乙酸乙烯酯共聚物的配制组合物,其形式为20密耳(0.51mm)厚的片材(Hi-Sheet Industries,Japan);
·FPF为1.5密耳(0.038mm)厚、经过电晕表面处理的Tedlar
Figure GPA00001137998700151
薄膜(DuPont);
·玻璃1为2.5mm厚的浮法玻璃;
·玻璃2为3.0mm厚的透明的退火浮法玻璃板层;
·玻璃3为得自PPG Industries(Pittsburgh,PA)的3.0mm厚的Solex
Figure GPA00001137998700152
阳光控制玻璃;
·玻璃4为得自PPG Industries的Starphire玻璃;
·ION 1为60密耳(1.52mm)厚的由离聚物A制得的压花片材,离聚物A具有大约2g/10min的MI,并且衍生自用钠离子中和了27%的其总羧酸含量的乙烯-甲基丙烯酸共聚物,其包含按所述酸性共聚物的总重量计22重量%的甲基丙烯酸的重复单元;
·ION 2为20密耳(0.51mm)厚的由离聚物B制得的压花片材,离聚物B具有2g/10min的MI,并且衍生自用锌离子中和了37%的其总羧酸含量的乙烯-甲基丙烯酸共聚物,其包含按所述酸性共聚物的总重量计19重量%的甲基丙烯酸的重复单元;
·ION 3为20密耳(0.51mm)厚、由Surlyn
Figure GPA00001137998700154
9950(DuPont)制得的压花片材;
·ION 4为离聚物,其具有5g/10min的MI和87℃的熔点,并且衍生自用锌离子中和了23%的其总羧酸含量的乙烯-甲基丙烯酸共聚物,其包含按所述酸性共聚物的总重量计15重量%的甲基丙烯酸的重复单元;
·ION 5为离聚物,其具有4.5g/10min的MI和88℃的熔点,并且衍生自用锌离子中和了51%的其总羧酸含量的乙烯-甲基丙烯酸共聚物,其包含按所述酸性共聚物的总重量计15重量%的甲基丙烯酸的重复单元;
·ION 6为离聚物,其具有14g/10min的MI和88℃的熔点,并且衍生自用锌离子中和了22%的其总羧酸含量的乙烯-甲基丙烯酸共聚物,其包含按所述酸性共聚物的总重量计15重量%的甲基丙烯酸的重复单元;
·PET 1为7密耳(0.18mm)厚、涂有聚(烯丙胺)底漆的双轴取向的聚(对苯二甲酸乙二醇酯)薄膜层;
·PET 2为XIR
Figure GPA00001137998700161
-70HP Auto薄膜(Southwall Company,Palo Alto,CA);
·PET 3为XIR
Figure GPA00001137998700162
-75Auto Blue V-1薄膜(Southwall);
·PET 4为Soft Look
Figure GPA00001137998700163
UV/IR 25阳光控制膜(Tomoegawa PaperCompany,Ltd.,Tokyo,Japan);
·PET 5为XIR
Figure GPA00001137998700164
-75Green薄膜(Southwall);
·PET 6为RAYBARRIERTFK-2583阳光控制膜(Sumitomo OsakaCement,Japan);
·PVB-A为20密耳(0.51mm)厚的由隔音级聚(乙烯醇缩丁醛)制得的压花片材;
·PVB-B为B51V,据信其为基于聚(乙烯醇缩丁醛)的配制组合物,其形式为20密耳(0.51mm)厚的片材(DuPont);
·太阳能电池1为10×10英寸(254×254mm)的非晶硅光伏器件,所述器件包括具有非晶硅半导体层的不锈钢基底(125μm厚)(参见例如美国专利6,093,581实施例1);
·太阳能电池2为10×10英寸(254×254mm)二硒铜铟(CIS)光伏器件(参见例如美国专利6,353,042第6栏第19行);
·太阳能电池3为10x10英寸(254x254mm)碲化镉(CdTe)光伏器件(参见例如美国专利6,353,042第6栏第49行);
·太阳能电池4为由10×10英寸(254×254mm)的EFG法生成的多晶硅片制成的硅太阳能电池(参见例如美国专利6660930第7栏第61行);
·TI 1为30密耳(0.76mm)厚的压花三层片材,其具有两个2密耳(0.06mm)厚的由三元离聚物A制得的表面亚层和由Surlyn
Figure GPA00001137998700166
9520(DuPont)制得的内亚层,其中三元离聚物A衍生自乙烯与丙烯酸正丁酯与甲基丙烯酸的聚合物,该共聚物包含按所述酸性共聚物的总重量计23重量%的丙烯酸正丁酯的重复单元和9重量%的甲基丙烯酸的重复单元,并且其总羧酸含量的40%用锌中和;
·TI 2为60密耳(1.52mm)厚的压花三层片材,其具有两个1密耳(0.03mm)厚的由组合物形成的表面亚层,该组合物包含按所述组合物的总重量计99.85重量%的三元离聚物B和0.15重量%的TINUVIN 328(Ciba Specialty Chemicals,Tarrytown,NY),和由离聚物C制得的内亚层,其中三元离聚物B具有10g/10min的MI,并且衍生自乙烯与丙烯酸正丁酯与甲基丙烯酸的聚合物,该共聚物包含按所述酸性三元共聚物的总重量计24重量%的丙烯酸正丁酯的重复单元和9重量%的甲基丙烯酸的重复单元,并其总羧酸含量的20%用锌离子中和,离聚物C具有5g/10min的MI,并且衍生自乙烯-甲基丙烯酸共聚物,该共聚物包含按所述酸性共聚物的总重量计15重量%的甲基丙烯酸的重复单元并且其总羧酸含量的70%用钠中和;
·TI 3为15密耳(0.38mm)厚的压花三层片材,其具有两个1密耳(0.03mm)厚的由三元离聚物B制得的表面亚层,和由Surlyn8660(DuPont)制得的内亚层;
·TI 4为90密耳(2.25mm)厚的压花三层片材,其具有两个2密耳(0.06mm)厚的由三元离聚物A制得的表面亚层和由离聚物D制得的内亚层,其中离聚物D具有1.5g/10min的MI并衍生自乙烯-甲基丙烯酸共聚物,该共聚物包含按酸性共聚物总重量计22重量%的甲基丙烯酸的重复单元并且其羧酸总含量的35%用钠中和;
·TI 5为20密耳(0.51mm)厚的压花三层片材,其具有1密耳(0.03mm)厚的由三元离聚物C制得的第一亚层和由Surlyn
Figure GPA00001137998700172
8940(DuPont)制得的第二亚层,其中三元离聚物C具有5g/10min的MI并衍生自乙烯与丙烯酸正丁酯与甲基丙烯酸的聚合物,该共聚物包含按酸性三元共聚物的总重量计24重量%的丙烯酸正丁酯的重复单元和9重量%的甲基丙烯酸的重复单元,并且其总羧酸含量的30%用锌中和;
·TI 6为20密耳(0.51mm)厚的压花三层片材,其具有两个2密耳(0.06mm)厚的由组合物制得的表面亚层,该组合物包含按所述组合物的总重量计99.5重量%的三元离聚物C和0.5重量%的CYASORB UV-1164(Cytec Indus tries Inc.,West Paterson,NJ),和由离聚物E制得的内亚层,其中离聚物E具有5g/10min的MI,并且衍生自乙烯-甲基丙烯酸共聚物,该共聚物包含按所述酸性共聚物的总重量计18重量%的甲基丙烯酸的重复单元并且其总羧酸含量的30%用锌中和;
·TI 7为1密耳(0.03mm)厚的由三元离聚物A制得的薄膜;
·TI 8为1密耳(0.03mm)厚的由三元离聚物D制得的薄膜,其中该三元离聚物D具有25g/10min的MI并且衍生自乙烯与丙烯酸正丁酯与甲基丙烯酸的聚合物,该共聚物包含按酸性三元共聚物的总重量计23重量%的丙烯酸正丁酯的重复单元和9重量%的甲基丙烯酸的重复单元并且总羧酸含量的15%用锌中和;
·TI 9为1密耳(0.03mm)厚的由组合物制得的薄膜,该组合物包含按所述组合物的总重量计99.4重量%的三元离聚物B,0.3重量%的TINUVIN 1577和0.3重量%的CHIMASSORB 944(CibaSpecialty Chemicals);
·TI 10为20密耳(0.51mm)厚的压花三层片材,其具有两个1密耳(0.03mm)厚的由三元离聚物D制得的表面亚层和由Surlyn
Figure GPA00001137998700181
9950(DuPont)制得的内亚层;
·TI 11为20密耳(0.51mm)厚的压花三层片材,其具有两个2密耳(0.06mm)厚的由三元离聚物B制得的表面亚层和由离聚物B制得的内亚层;
·TI 12为20密耳(0.51mm)厚的压花三层片材,其具有两个1密耳(0.03mm)厚的由三元离聚物C制得的表面亚层和由离聚物E制得的内亚层,其中离聚物E具有5g/10min的MI并衍生自乙烯-甲基丙烯酸共聚物,该共聚物包含按酸性共聚物总重量计15重量%的甲基丙烯酸的重复单元并且其总羧酸含量的30%用锌中和;
·TI 13为三元离聚物,其具有10g/10min的MI并且衍生自乙烯与丙烯酸正丁酯与甲基丙烯酸的聚合物,该共聚物包含按所述酸性共聚物的总重量计23.5重量%的丙烯酸正丁酯的重复单元和9重量%的甲基丙烯酸的重复单元并且其总羧酸含量的19%用锌离子中和;
·TI 14为三元离聚物,其具有5g/10min的MI并且衍生自乙烯与丙烯酸正丁酯与甲基丙烯酸的聚合物,该共聚物包含按所述酸性共聚物的总重量计23.5重量%的丙烯酸正丁酯的重复单元和9重量%的甲基丙烯酸的重复单元并且其总羧酸含量的32%用锌离子中和;
·TI 15为三元离聚物,其具有5g/10min的MI和81℃的熔点并且衍生自乙烯与丙烯酸异丁酯与甲基丙烯酸的聚合物,该共聚物包含按所述酸性共聚物的总重量计10重量%的丙烯酸异丁酯的重复单元和10重量%的甲基丙烯酸的重复单元并且其总羧酸含量的16%用锌离子中和;
TPT为AkasolPTL 3-38/75薄膜层(Akasol
Figure GPA00001137998700192
薄膜层;August Krempel Soehne GmbH & Co.,Germany),其被描述为7密耳厚的具有底漆的聚(偏二氟乙烯)/聚(对苯二甲酸乙二醇酯)/聚(偏二氟乙烯)白色三层薄膜。
实施例1-14
按照层压方法1组装和层压下表1所述的一系列12×12英寸(305×305mm)太阳能电池层压结构体。层1和层2分别构成入射层和前包封层,并且层4和层5分别构成后包封层和背衬层。
表1
Figure GPA00001137998700201
实施例15-28
按照层压方法2组装和层压上表1所述的一系列12×12英寸(305×305mm)太阳能电池层压结构体。层1和层2分别构成入射层和前包封层,并且层4和层5分别构成后包封层和背衬层。
实施例29-35
采用常规的共挤压浇铸片材方法制备下表2中所述的三层片材结构体。将下表2中所述的内层(层2)组合物送入直径为1.5英寸(3.8cm)的Killion
Figure GPA00001137998700202
挤出机(挤出机A)中,该挤出机具有如下温度特征:
挤出机区域    温度(℃)
进料          环境
区域1         200
区域2         200
区域3         200
模座          220
模头          220
将下表2中列出的表面层(层1和3)的组合物喂入直径为1.25英寸(3.2cm)的Killion
Figure GPA00001137998700211
挤出机(挤出机B)中,该挤出机具有如下温度特征
挤出机区域    温度(℃)
进料          环境
区域1         200
区域2         200
区域3         200
通过将螺杆转速调至71.4rpm来控制挤出机A的生产能力。通过将螺杆转速调至19.5rpm(实施例29-34)和90rpm(实施例35)来控制挤出机B的生产能力。挤出机具有14英寸(36cm)的“衣架型”共挤压模头,该模头具有0.03英寸(0.8mm)的标称间隙。从挤出机A挤出的聚合物形成内层,并且从挤出机B挤出的聚合物形成三层片材的两个表面层。将铸态的三层片材送入三辊组中,该三辊组包括一个覆盖了Teflon
Figure GPA00001137998700212
脱模薄膜、直径为6英寸(15cm)的橡胶咬送辊和两个温度介于6℃和12℃之间、直径为12英寸(30cm)的抛光铬冷却辊。然后,将三层片材以4.3英尺/分钟(1.3米/分钟)的速度缠绕到纸板芯上。
表2
Figure GPA00001137998700213
比较实施例CE1
通过堆叠3.2mm厚的Krystal Klear
Figure GPA00001137998700214
玻璃层(Krystal Klear
Figure GPA00001137998700215
玻璃层;AFG Industries,Inc.,Kings por t,TN)、两层20密耳(0.51mm)厚的由ION 4构成的片材、和Akasol
Figure GPA00001137998700221
薄膜层来制备6×6英寸(152×152mm)的预层压组合件。然后在Meier层压机中层压所述预层压组合件。层压循环包括5.5分钟的排空步骤(1毫巴真空),1分钟的压力积聚步骤,和155℃温度下4分钟加压阶段(999毫巴压力)。
根据用100mm/min夹头速度改进的ASTM D903,使用Instron
Figure GPA00001137998700222
1125型(1000lb(454kg)测试架)测试仪,使两个所得层压板样本经历聚合物层和玻璃层之间180°剥离强度粘合性测试。结果示于下表3中。
同样将两个层压板样本在85℃和85%相对湿度环境中保持840小时,之后在聚合物层和玻璃层之间进行180°剥离强度测试,所得结果也示于下表3中。
表3
Figure GPA00001137998700223
实施例36-40
通过在150℃的层压温度下用下表4中所列的三层片材代替两个ION4片材来制备与比较实施例CE1中类似的层压板样本。对所得层压板进行比较实施例CE1中所述的180°剥离强度粘附性测试,所得结果示于上表3中。同样将层压板在85℃和85%相对湿度环境中保持950小时,之后在聚合物层和玻璃层之间进行180°剥离强度测试,所得结果示于上表3中。如表3所示,离聚物片材(比较实施例CE1)的180°剥离强度在湿热老化后从粘结破坏显著降低至约3N/mm,而对于三元离聚物三层片材(实施例36-40)而言,在湿热老化后保持了约75%的剥离强度。
表4
实施例    聚合物片材(实施例编号)
                                   
36        29
37        30
38        33
39        34
40        35
                                   

Claims (15)

1.太阳能电池预层压组合件,所述太阳能电池预层压组合件包括三元离聚物多层膜或片材和由一个或多个电互连的太阳能电池形成的太阳能电池组件,其中
所述太阳能电池组件具有面向光源的受光面和背离所述光源的背面;
所述三元离聚物多层膜或片材包括第一表面亚层、第二表面亚层、以及夹置在所述第一表面亚层和第二表面亚层之间的任选一个或多个内亚层;
所述三元离聚物多层膜或片材的第一表面亚层包含三元离聚物;
所述三元离聚物多层膜或片材的第二表面亚层、所述三元离聚物多层膜或片材的至少一个任选的内亚层或两者包含高熔点聚合物;
所述三元离聚物衍生自酸性三元共聚物,所述酸性三元共聚物按所述酸性三元共聚物的总羧酸含量计约5%至约90%用一种或多种金属离子进行中和,并且所述三元离聚物包含重复单元,所述重复单元衍生自α-烯烃,按所述酸性三元共聚物的总重量计约5至约15重量%的具有3至8个碳的α,β-烯键式不饱和羧酸,以及约15至约40重量%的具有4至12个碳的α,β-烯键式不饱和羧酸酯;并且所述高熔点聚合物具有至少约80℃的熔点。
2.权利要求1的组合件,其中所述三元离聚物多层膜或片材的第二表面亚层包含所述高熔点聚合物。
3.权利要求1或2的组合件,其中所述三元离聚物多层膜或片材包括一个或多个内亚层;所述亚层中的至少一层包含所述高熔点聚合物;并且所述高熔点聚合物为具有至少90℃的熔点的离聚物。
4.权利要求1、2、或3的组合件,其中
所述三元离聚物多层膜或片材的第一表面亚层和第二表面亚层中的每一层包含所述三元离聚物;
所述三元离聚物衍生自所述酸性三元共聚物,所述酸性三元共聚物的约10%至约50%的酸性基团用钠离子、锂离子、镁离子、锌离子、或它们中的两种或更多种的混合物进行中和;并且
所述酸性三元共聚物包含按所述酸性三元共聚物的总重量计约7至11重量%的α,β-烯键式不饱和羧酸的重复单元和约20至约30重量%的α,β-烯键式不饱和羧酸酯的重复单元。
5.权利要求1、2、3、或4的组合件,其中所述酸性三元共聚物为用锌离子中和了约20%至约40%的乙烯与丙烯酸丁酯与甲基丙烯酸的共聚物;或用锌离子中和了约20%至约40%的乙烯与丙烯酸丁酯与甲基丙烯酸的共聚物。
6.权利要求1、2、3、4、或5的组合件,其中
每个表面亚层的所述三元离聚物多层膜或片材具有0.013mm至0.13mm的厚度;
所述高熔点聚合物的所述三元离聚物多层膜或片材具有0.013mm至0.48mm的厚度;并且
所述三元离聚物多层膜或片材的总厚度在0.051mm至0.51mm的范围内。
7.权利要求1、2、3、4、5、或6的组合件,其中所述太阳能电池为多晶太阳能电池、薄膜太阳能电池、化合物半导体太阳能电池、非晶硅太阳能电池、或两种或更多种的组合。
8.权利要求1、2、3、4、5、6、或7的组合件,所述组合件包括邻近所述太阳能电池组件的受光面放置的前包封层和邻近所述太阳能电池组件的背面放置的后包封层,其中
所述前包封层由所述三元离聚物多层膜或片材形成;
所述后包封层由下列形成:酸性共聚物、离聚物、乙烯乙酸乙烯酯、聚(乙烯醇缩醛)、聚氨酯、聚氯乙烯、聚乙烯、聚烯烃嵌段弹性体、α-烯烃与α,β-烯键式不饱和羧酸酯的共聚物、硅氧烷弹性体、环氧树脂、或它们中的两种或更多种的组合;并且
所述聚(乙烯醇缩醛)优选包括隔音级聚(乙烯醇缩醛)。
9.权利要求8的组合件,其中所述前包封层和所述后包封层中的每层包括或由所述三元离聚物多层膜或片材形成。
10.权利要求8或9的组合件,所述组合件还包括邻近所述前包封层放置的入射层和邻近所述后包封层放置的背衬层,其中所述入射层为(i)玻璃片,(ii)由聚碳酸酯、丙烯酸类、聚丙烯酸酯、环状聚烯烃、聚苯乙烯、聚酰胺、聚酯、含氟聚合物、或它们中的两种或更多种的组合形成的聚合物片材,或(iii)由聚酯、聚碳酸酯、聚烯烃、降冰片烯聚合物、聚苯乙烯、苯乙烯-丙烯酸酯共聚物、丙烯腈-苯乙烯共聚物、聚砜、尼龙、聚氨脂、丙烯酸类、醋酸纤维素、玻璃纸、聚(氯乙烯)、含氟聚合物、或它们中的两种或更多种的组合形成的聚合物膜。
11.权利要求8、9、或10的组合件,其中
所述背衬层为(i)玻璃片,(ii)聚合物片材,(iii)聚合物膜,(iv)金属片材,或(v)陶瓷板;
所述聚合物片材包含或由聚碳酸酯、丙烯酸类、聚丙烯酸酯、环状聚烯烃、聚苯乙烯、聚酰胺、聚酯、含氟聚合物、或它们中的两种或更多种的组合形成;并且
所述聚合物膜包含或由聚酯、聚碳酸酯、聚烯烃、降冰片烯聚合物、聚苯乙烯、苯乙烯-丙烯酸酯共聚物、丙烯腈-苯乙烯共聚物、聚砜、尼龙、聚氨酯、丙烯酸类、乙酸纤维素、玻璃纸、聚(氯乙烯)、含氟聚合物、或它们中的两种或更多种的组合形成。
12.权利要求1、2、3、4、5、6、7、或8的组合件,所述组合件从面向所述光源的顶面到背离所述光源的背面基本上由以下组成:(i)邻近(ii)放置的入射层,(ii)邻近(iii)放置的前包封层,(iii)邻近(iv)放置的所述太阳能电池组件,(iv)邻近(v)放置的后包封层,(v)背衬层,其中所述前包封层、所述后包封层或两者由所述三元离聚物多层膜或片材形成。
13.方法,所述方法包括:(i)提供太阳能电池预层压组合件和(ii)层压所述组合件以形成太阳能电池模块,其中所述组合件为如权利要求1至12中任一项所表征的,并且层压优选地通过加热所述组合件来进行。
14.权利要求13的方法,其中所述层压还包括对所述组合件施加真空或压力。
15.太阳能电池模块,所述太阳能电池模块包括或由太阳能电池预层压组合件制成,其中所述组合件为如权利要求1至12中任一项所表征的,并且优选地,将所述模块在约85℃的温度和约85%的相对湿度下调理1000小时后,所述三元离聚物多层膜或片材与其相邻的一个或多个层之间至少约75%的180°剥离强度得以保持。
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