CN102870228B - 太阳能电池组件的背板及其制造方法 - Google Patents
太阳能电池组件的背板及其制造方法 Download PDFInfo
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Abstract
本发明提供一种太阳能电池组件的背板,所述背板包括:聚酯膜层,该聚酯膜层具有在其一侧或两侧上形成的容易粘合的亚克力涂层;以及氟涂层,该氟涂层是通过将氟涂布组合物涂到所述亚克力涂层的上侧而制备的,该氟涂布组合物含有二氧化钛和从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的含氟树脂。可以通过简单过程生产本公开所描述的太阳能电池组件的背板,由此减低生产成本同时显示与密封材料的优异粘合性。
Description
技术领域
本发明涉及一种太阳能电池组件的背板,更具体地,涉及一种背板,其具有与氟涂层的提高的粘合性和降低的生产成本,与常规方法相比,所述背板通过经由涂布将氟涂层涂到聚酯膜而制成,在所述常规方法中,由包括PVF(聚氟乙烯)膜/PET膜/PVF(聚氟乙烯)膜(“TPT类型”)的层压件形成背板,该方法利用粘合剂将这些膜彼此粘合并层压。
背景技术
用于太阳能发电的太阳能电池由硅或其它各种化合物构成,并且成为太阳能电池形式以产生电能。然而,由于一个太阳能电池不能提供足够的能量,因此应该将多个电池布置为串联或并联,这种布置一般被称作“太阳能电池组件”。
通过按相继顺序层压背板、EVA、太阳能电池、EVA和玻璃层来制造太阳能电池组件。背板是用于形成组件底部的材料并且通常由TPT类型材料制成,用作电流通路的带状物由涂覆有银或锡铅的铜材料制成。
太阳能电池组件的背板是位于太阳能电池组件背面上的重要材料(作为最外层),因为它保护电池。由于需要诸如耐用性、不受天气影响的能力、绝缘、防水性能等各种特征,因此通常通过将氟膜和PET膜层压来制造背板。
关于这点,氟膜可以具有良好的不受天气影响的能力和耐用性。目前,通常使用DuPont在1961年研制的由PVF树脂制成的聚氟乙烯膜。然而,由于聚氟乙烯膜供应不足,一些厂商使用诸如PET的其它膜替代聚氟乙烯膜。
在卫星中使用的另一种太阳能电池材料EVA通过NASA(NationalAeronauticsandSpaceAdministration,美国国家航空航天局)和DuPont的联合开发在1970年被创造出。EVA目前被用作太阳能电池的标准密封材料。在此领域,日本公司三井(Mitsui)化学(普利司通)占据全球市场的70%或更多。密封材料用于密封单个电池并且对太阳能电池内的单个电池进行填充,并且具有优异的强度、透明度和绝缘性能。
聚对苯二甲酸乙二醇酯(PET)膜由具有预定厚度和物理特性的平面塑料膜制成,并且表现出足够形成背板的基本框架的高强度。此材料具有优异的物理、化学、机械和/或光学特性,从而应用于很大范围,包括例如,食品包装、办公用品、先进的电和电子产品,诸如半导体或显示器等。由于耐用性和不受天气影响的能力高,近来使用PET膜作为太阳能电池的背板有所增加。
此外,可以利用含铁量下降的玻璃,来防止光反射。
根据常规方法,需要通过聚氟乙烯膜和PET膜层压TPT类型背板,聚氟乙烯膜和PET膜通过利用粘合剂粘附在所述背板上,并且,为了将EVA膜作为密封材料粘附到背板上,额外需要通过利用聚氨酯粘合剂等将EVA膜粘附到背板的过程。然而,聚氟乙烯膜价格昂贵,甚至占背板总生产成本的80%或更多,因此导致背板价格升高。
发明内容
技术问题
大量研究结果表明,为了解决上述过程中由于多阶段地应用粘合剂而导致的常规问题并且为了克服由使用聚氟乙烯膜导致的价格升高,本发明的发明人发现,如果经由离线涂布(off-linecoating)将氟涂布组合物涂到聚酯膜,以形成替代现有聚氟乙烯膜层的氟涂层,则可以有利地减少过程和降低成本,由此实现本发明。
另外,为了提高氟涂层和聚酯膜之间的粘合性,已经发现当在聚酯膜的一侧或两侧上形成容易粘合的亚克力涂层时,可以提高氟涂层和聚酯膜之间的粘合性并且基于上述发现完成本发明。具体地,已经发现,如果在生产聚酯膜期间通过在线涂布(in-linecoating)形成容易粘合的亚克力涂层,则可以提高亚克力涂层和聚酯膜之间的粘合性,由此完成本发明。
就是说,本发明的一个目的是研制可替代现有太阳能电池组件背板中使用的由聚氟乙烯膜/PET膜/聚氟乙烯膜构成的层压结构中的聚氟乙烯膜的氟涂布合物,由此降低产品价格。
本发明的另一目的是提供一种通过形成容易粘合的亚克力涂层而具有优异粘合性的背板膜,以便提高氟涂布组合物和聚酯膜之间的粘合性。
技术方案
为了解决上述问题,在一个总的方面,本发明的特征在于,利用具有优异物理特性的氟涂布组合物通过离线涂布形成氟涂层,从而用氟涂层替代包括聚氟乙烯膜/PET膜/聚氟乙烯膜的常规层压结构中的聚氟乙烯膜。
然而,在通过离线涂布将氟涂布组合物涂到PET膜的情形中,粘合性会降低,从而导致分层。因此,本发明的发明人发现,在PET膜制造过程中的拉伸期间通过经由在线涂布涂水可分散的组分(乳剂)可以提高氟涂层的粘合性,以便在PET膜上形成容易粘合的亚克力涂层,同时减小涂布厚度。由此,完成本发明。
更具体地,本发明提供一种太阳能电池组件的背板,所述背板包括:聚酯膜层,该聚酯膜层具有在其一侧或两侧上形成的容易粘合的亚克力涂层;以及氟涂层,该氟涂层是通过将氟涂布组合物涂到所述亚克力涂层的上侧而制备的,该氟涂布组合物含有二氧化钛和从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的氟树脂。
本发明还提供一种制造太阳能电池组件的背板的方法,所述方法包括:a)通过将聚酯树脂熔化挤出制备聚酯板;b)沿纵向拉伸所述聚酯板;c)将亚克力乳剂涂到沿纵向拉伸的所述聚酯膜的一侧或两侧,以形成容易粘合的亚克力涂层,然后沿横向拉伸经涂布的聚酯膜,所述亚克力乳剂含有2wt%至10wt%的亚克力粘合剂树脂、0.2wt%至4wt%的基于三聚氰胺的交联剂、0.02wt%至0.5wt%的固化催化剂以及余量的水至100wt%;d)对双轴向拉伸的聚酯膜进行热定型;以及e)通过离线涂布,将氟涂布组合物涂到所述容易粘合的亚克力涂层的上侧,以形成氟涂层,该氟涂布组合物含有二氧化钛和从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的氟树脂。
下面将详细描述本发明。
本发明的聚酯膜可以通过使用聚对苯二甲酸乙二醇酯、聚萘二甲酸乙二醇酯(polyethylenenaphthalate)等来形成。
本发明生产期间通过在线涂布在聚酯膜一侧或两侧上形成容易粘合的亚克力涂层。本发明可以使用容易粘合的亚克力涂层在聚酯膜上形成氟涂层。
所述容易粘合的亚克力涂层可以具有50nm至300nm的干涂层厚度,以提供优异的粘合性。
所述容易粘合的亚克力涂层优选由含有2wt%至10wt%的亚克力粘合剂树脂的基于亚克力的乳剂、0.2wt%至4wt%的基于三聚氰胺的交联剂、0.02wt%至0.5wt%的固化催化剂以及欲到达100wt%的剩余量的水制备。
亚克力粘合剂树脂可以包括诸如甲基丙烯酸甲酯(methylmethacrylate),甲基丙烯酸乙酯(ethylmethacrylate),甲基丙烯酸异丁酯(isobutylmethacrylate),甲基丙烯酸正丁基甲酯(normalbutylmethylmethacrylate),丙烯酸和甲基丙烯酸的共聚物或三元共聚物。亚克力粘合剂树脂可以是市场中可商业获得的亚克力粘合剂,例如二液型粘合剂Primal-1018或单液型粘合剂Primal-3208(DowCo.)等。上述含量范围表示固体状态的含量,即固体含量。
在后处理期间,基于三聚氰胺的交联剂可以增大亚力克粘合剂的交联密度,提高其与聚酯膜的紧密粘合、其与氟涂层的粘合性。更具体地,优选使用甲氧甲基羟甲基三聚氰胺(methoxymethylmethylolmelamine),并且其含量范围为0.2wt%至4wt%。更优选地,所述含量范围为0.5wt%至3wt%。
此外,固化催化剂可以包括硫氰酸铵。固化催化剂的含量范围可以为0.02wt%至0.5wt%,以便提高亚克力粘合剂的固化程度。
根据本发明,氟涂层用于替代由聚氟乙烯(PVF)构成的氟膜并且通过经由离线涂布将氟涂布组合物涂到容易粘合的亚克力涂层的上侧,然后对其进行干燥而形成。
本发明的氟涂布组合物可以包括从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的氟树脂以及二氧化钛。
氟树脂可以是聚偏二氟乙烯、四氟乙烯-六氟丙烯-偏二氟乙烯等,但是不特定限制于此,只要氟树脂可溶于溶剂中并且可用于离线涂布即可。氟树脂的含量可以为氟涂布组合物总重量的10wt%至30wt%,以便提供适合的干涂层厚度。
二氧化钛可以是粒径为150nm至300nm的金红石型二氧化钛,以实现优异的UV屏蔽性能。金红石型二氧化钛的含量范围可以为氟树脂量的30wt%至40wt%。就是说,优选使用占氟涂布组合物总重量的3wt%至12wt%的金红石型二氧化钛。
为了通过离线涂布涂氟涂布组合物,在溶剂等中溶解氟涂布组合物之后可以使用树脂。可使用的溶剂可以包括基于碳氢化合物的溶剂、基于酮的溶剂等。优选使用二甲基乙酰胺、二甲基甲酰胺、N-甲基-2-吡咯烷酮(N-methyl-2-pyrrolidone)等。
这种离线涂布方法可以包括辊式涂布、铸模涂布、逗号涂布(commacoating)等。优选地,进行涂布以提供10μm至30μm的干涂层厚度,由此显示优异的UV屏蔽特性。
接着,将详细描述根据本发明的背板制造方法。
根据本发明,所述制造方法可以包括将聚酯树脂熔化挤压以制备板,单轴向地拉伸所述板,涂亚克力乳剂并且沿横向双轴向地拉伸所涂布的板以形成聚酯膜;以及将氟涂布组合物涂到所形成的聚酯膜。
更具体地,所述背板的制造方法包括:a)通过将聚酯树脂熔化挤压来制备聚酯板;b)沿纵向拉伸所述聚酯板;c)将亚克力乳剂涂到沿纵向拉伸的所述聚酯膜的一侧或两侧,以形成容易粘合的亚克力涂层,然后沿横向拉伸经涂布的聚酯膜,所述亚克力乳剂含有2wt%至10wt%的亚克力粘合剂树脂、0.2wt%至4wt%的基于三聚氰胺的交联剂、0.02wt%至0.5wt%的固化催化剂以及欲到达100wt%的剩余量的水;d)对双向拉伸的聚酯膜进行热定型;以及e)通过离线涂布,将氟涂布组合物涂到所述容易粘合的亚克力涂层的上侧,以便形成氟涂层,该氟涂布组合物含有二氧化钛和从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的氟树脂。
如果需要的话,可以在涂亚克力乳剂之前或在涂氟涂布组合物之前进行电晕处理。
步骤(a)是通过经由圆筒将树脂熔化挤出并使所述树脂穿过T型模头制备聚酯膜以形成板的过程。
步骤(b)是通过双轴向地拉伸聚酯板并且优选利用至少一个辊进行纵向拉伸来制备聚酯膜的过程。
步骤(c)是通过在线涂布方式形成容易粘合的亚克力涂层的过程,在此情形中,优选使用水可分散的乳剂来进行在线涂布。
就此,适于形成容易粘合的亚克力涂层的乳剂的构成组分基本与上述相同,并且在拉伸之后可以执行涂布过程以提供50nm至300nm的干涂层厚度。
在涂亚克力乳剂以形成容易粘合的亚克力涂层之后,沿横向进行拉伸。可以通过利用拉幅机执行横向拉伸。
接着,为了去除容易粘合的亚克力涂层中的水分,固化亚克力涂层并防止所述膜收缩,采用干燥和热定型过程。
之后,通过离线涂布涂氟涂布组合物以形成氟涂层,在此情形中,氟涂层可以具有10μm至30μm的干涂层厚度。
有益效果
可以通过简单的过程以降低的生产成本制造根据本发明的太阳能电池组件的背板,并且其显示与密封材料的优异的粘合性。
具体实施方式
在下文中,下述描述将说明本发明实施例,但是不限于此。
下面描述物理性能的测量。
1.粘合性
采用ASTMD3359-97“通过胶带测试测量粘合力的标准试验方法(StandardTestMethodsForMeasuringAdhesionByTapeTest)”。
评定标准如下:
A:未剥去涂层
B:剥去10%的涂层
C:剥去14%的涂层
D:剥去31%的涂层
通过:A
未通过:B、C、D
2.UV屏蔽
测量仪器:使用BarianCary5000UV可见光分光光度计。
UV透射率(%):在制造背板之后,氟涂层正面朝向UV光源,并且在整个UV波长范围内(200nm至400nm)测量UV透射率。使用显示测量范围内400nm时的UV透射率的测量值。
通过:UV透射率小于1%
未通过:UV透射率大于1%或更大
[例子1]
制备容易粘合的亚克力乳剂(1)
将4wt%的亚克力粘合剂树脂(Primal-3208固体含量;DowCo.),作为基于三聚氰胺的交联剂的1.5wt%的甲氧甲基羟甲基三聚氰胺,作为固化剂的0.15wt%的硫氰酸铵,以及94.35wt%的水混合,以制备亚克力乳剂。
制备用于背板的聚酯膜
水分去除至100ppm或更少的聚对苯二甲酸乙二醇酯片被放入熔化挤出机并熔化。当通过T型模头挤出熔化的产品时,产品在20℃的表面温度下在铸造滚筒中迅速冷却并且固化,以产生厚度为2000μm的聚对苯二甲酸乙二醇酯板。
在110℃沿纵向(MD)拉伸所生产的聚对苯二甲酸乙二醇酯板达3.5倍之后,经拉伸的板在室温冷却。在此之后,将容易粘合的亚克力溶剂(1)通过棒式涂布涂到板的一侧,并且在140℃对其进行预热和干燥之后,在横向(TD)执行拉伸到3.5倍。然后利用5阶拉幅机在235℃执行热处理,在200℃下在MD和TD两个方向上执行10%的松弛,之后热定型,从而获得厚度为250μm的双轴向拉伸的膜,其具有形成在膜一侧的容易粘合的亚克力涂层。在拉伸之后,容易粘合的亚克力涂层具有80nm的干涂层厚度。
太阳能电池组件的背板的制造
以15μm的干涂层厚度将氟涂布组合物涂到形成在双轴向拉伸的聚酯膜上的亚克力涂层上侧,该氟涂布组合物含有通过砂磨分散于其中的20wt%的聚偏二氟乙烯、5wt%的二氧化钛(金红石型,粒径:220nm)和75wt%的溶剂(二甲基乙酰胺)。
表1示出所制造的背板的物理特性。
[例子2]
除了在背板制造期间将二氧化钛的含量控制到6wt%之外,通过与例子1所描述的相同过程制造背板。
表1示出所制造的背板的物理特性。
[例子3]
除了在背板制造期间将二氧化钛的含量控制到7wt%之外,通过与例子1所描述的相同过程制造背板。
表1示出所制造的背板的物理特性。
[例子4]
除了在背板制造期间将二氧化钛的含量控制到8wt%之外,通过与例子1所描述的相同过程制造背板。
表1示出所制造的背板的物理特性。
[例子5]
除了在制造背板期间由四氟乙烯-六氟丙烯-偏二氟乙烯(THV)替代聚偏二氟乙烯并且使用粒径为150nm的二氧化钛之外,通过与例子1所描述的相同过程制造背板。
表1示出所制造的背板的物理特性。
[对比例1]
除了在制造背板期间使用不含二氧化钛的氟涂布组合物之外,通过与例子1所描述的相同过程制造背板。
就是说,以15μm的干涂层厚度涂包含20wt%的聚偏二氟乙烯和80wt%溶剂(二甲基乙酰胺)的氟涂布组合物。
表1示出所制造的背板的物理特性。
[对比例2]
根据例子1的过程制造背板,使得在制造背板期间,以15μm的干涂层厚度涂氟涂布组合物,该氟涂布组合物含有通过砂磨分散于其中的20wt%的聚偏二氟乙烯、4wt%的二氧化钛(金红石型,粒径:220nm)和80wt%的溶剂(二甲基乙酰胺)。
表1示出所制造的背板的物理特性。
[对比例3]
除了所涂的亚克力涂层的干涂层厚度为40nm之外,通过与例子1所描述的相同过程制造背板。
表1示出所制造的背板的物理特性。
[对比例4]
使得在制造背板期间,以15μm的干涂层厚度将氟涂布组合物涂到经由电晕放电被表面处理的双轴向拉伸的聚酯膜上侧,该氟涂布组合物含有通过砂磨分散于其中的20wt%的聚偏二氟乙烯、5wt%的二氧化钛(金红石型,粒径:220nm)和75wt%的溶剂(二甲基乙酰胺)。
表1示出所制造的背板的物理特性。
[表1]
粘合性 | UV屏蔽性能 | |
例子1 | A | 通过 |
例子2 | A | 通过 |
例子3 | A | 通过 |
例子4 | A | 通过 |
例子5 | A | 通过 |
对比例1 | A | 未通过 |
对比例2 | A | 未通过 |
对比例3 | D | 通过 |
对比例4 | D | 通过 |
工业应用性
可以通过简单的过程以降低的生产成本制造根据本发明的太阳能电池组件的背板,并且其显示与密封材料的优异的粘合性。
Claims (10)
1.一种太阳能电池组件的背板,所述背板包括:
聚酯膜层,该聚酯膜层具有在其一侧或两侧上形成的容易粘合的亚克力涂层;以及
氟涂层,该氟涂层是通过将氟涂布组合物涂到所述亚克力涂层的上侧而制备的,该氟涂布组合物含有二氧化钛和从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的氟树脂,
其中,所述容易粘合的亚克力涂层使用亚克力乳剂通过在拉伸所述聚酯膜层期间在线涂布而被涂布在所述聚酯膜层上。
2.根据权利要求1所述的背板,其中,所述二氧化钛是粒径为150nm至300nm的金红石型二氧化钛。
3.根据权利要求1所述的背板,其中,在拉伸所述聚酯膜层期间,所述亚克力乳剂含有2wt%至10wt%的亚克力粘合剂树脂、0.2wt%至4wt%的基于三聚氰胺的交联剂、0.02wt%至0.5wt%的固化催化剂以及余量的水至100wt%。
4.根据权利要求3所述的背板,其中,所述基于三聚氰胺的交联剂包括甲氧甲基羟甲基三聚氰胺。
5.根据权利要求1所述的背板,其中,所述容易粘合的亚克力涂层具有50nm至300nm的干涂层厚度,以及所述氟涂层具有10μm至30μm的干涂层厚度。
6.根据权利要求1所述的背板,其中,所述拉伸是在进行纵向拉伸之后涂所述亚克力乳剂然后进行横向拉伸的双轴向拉伸过程。
7.一种制造太阳能电池组件的背板的方法,所述方法包括:
a)通过将聚酯树脂熔化挤出制备聚酯板;
b)沿纵向拉伸所述聚酯板;
c)将亚克力乳剂涂到沿纵向拉伸的所述聚酯板的一侧或两侧,以形成容易粘合的亚克力涂层,然后沿横向拉伸经涂布的聚酯板,所述亚克力乳剂含有2wt%至10wt%的亚克力粘合剂树脂、0.2wt%至4wt%的基于三聚氰胺的交联剂、0.02wt%至0.5wt%的固化催化剂以及余量的水至100wt%;
d)对双轴向拉伸的聚酯板进行热定型;以及
e)通过离线涂布,将氟涂布组合物涂布到所述容易粘合的亚克力涂层的上侧,以形成氟涂层,该氟涂布组合物含有二氧化钛和从聚偏二氟乙烯或四氟乙烯-六氟丙烯-偏二氟乙烯中选择的氟树脂。
8.根据权利要求7所述的方法,其中,所述二氧化钛是粒径为150nm至300nm的金红石型二氧化钛,并且所述二氧化钛的含量为30wt%至40wt%。
9.根据权利要求7所述的方法,其中,所述基于三聚氰胺的交联剂包括甲氧甲基羟甲基三聚氰胺。
10.根据权利要求7所述的方法,其中,所述容易粘合的亚克力涂层具有50nm至300nm的干涂层厚度,并且所述氟涂层具有10μm至30μm的干涂层厚度。
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WO2013180552A1 (ko) * | 2012-06-01 | 2013-12-05 | 주식회사 엘지화학 | 친환경 광전지 모듈용 백시트 및 이의 제조방법 |
CN103151407B (zh) * | 2013-01-30 | 2015-06-17 | 宁波长阳科技有限公司 | 一种太阳能电池背板及其制备方法 |
CN103579391B (zh) * | 2013-11-07 | 2017-02-15 | 英利集团有限公司 | 太阳能电池背板及具有其的太阳能电池组件 |
WO2015099059A1 (ja) * | 2013-12-27 | 2015-07-02 | 電気化学工業株式会社 | 多層シート、太陽電池用バックシート及び太陽電池モジュール |
CN103921519B (zh) * | 2014-03-19 | 2015-11-11 | 浙江歌瑞新材料有限公司 | 一种太阳能电池背板膜及其制备方法 |
JP2015185687A (ja) * | 2014-03-24 | 2015-10-22 | 富士フイルム株式会社 | 太陽電池用バックシート部材及びその製造方法、太陽電池用バックシート並びに太陽電池モジュール |
TWI544652B (zh) * | 2015-01-19 | 2016-08-01 | 台虹科技股份有限公司 | 太陽能電池背板 |
CN106159039A (zh) * | 2016-07-27 | 2016-11-23 | 无锡中洁能源技术有限公司 | 一种带有透明涂层太阳能背板的生产工艺 |
CN107254060A (zh) * | 2017-05-12 | 2017-10-17 | 江苏东昇光伏科技有限公司 | 一种含氟太阳能电池背板的制备方法 |
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EP2561552A2 (en) | 2013-02-27 |
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