CN108239486A - 抗蜗牛纹eva胶膜 - Google Patents

抗蜗牛纹eva胶膜 Download PDF

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CN108239486A
CN108239486A CN201611215046.0A CN201611215046A CN108239486A CN 108239486 A CN108239486 A CN 108239486A CN 201611215046 A CN201611215046 A CN 201611215046A CN 108239486 A CN108239486 A CN 108239486A
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adhesive film
eva adhesive
snail line
crosslinking agent
eva
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陈荣
张圣博
张定忠
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Canadian Solar Inc
Changshu Tegu New Material Technology CoLtd
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Changshu Tegu New Material Technology CoLtd
Atlas Sunshine Power Group Co Ltd
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    • C09J4/00Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
    • C09J4/06Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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    • C09J2203/00Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/322Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
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    • C09J2301/40Additional features of adhesives in the form of films or foils characterized by the presence of essential components
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Abstract

本发明提供了一种抗蜗牛纹EVA胶膜,所述抗蜗牛纹EVA胶膜选用乙酸乙烯(VA)质量百分比为28~33%、熔融指数为22~28g/10min的EVA原料,所述EVA原料还包括质量百分比为0.5~0.8%的主交联剂,0.4~0.8%的助交联剂,0.1~0.3%的光稳定剂,0.1~0.5%的偶联剂,0.1~0.3%的抗氧剂及0.1~0.3%的疏水剂。本发明的抗蜗牛纹EVA胶膜,通过调整EVA胶膜生产过程中EVA原料的组分及交联剂的类型,从根本上解决因交联剂残留造成的蜗牛纹,提高光伏组件使用的稳定性;同时,在EVA胶膜生产原料中加入疏水剂,阻止水汽穿过EVA胶膜的背板面,保护封装材料的绝缘性能,从而进一步保证光伏组件的正常发电。

Description

抗蜗牛纹EVA胶膜
技术领域
本发明涉及一种EVA胶膜,尤其涉及一种抗蜗牛纹EVA胶膜。
背景技术
传统的EVA胶膜在层压后的光伏组件使用过程中,随着时间的推移,光伏组件电池片上会出现暗色线条纹,由于其形状类似蜗牛的爬痕,故称之为蜗牛纹。
通过对产生蜗牛纹的光伏组件作进一步EL成像分析发现,蜗牛纹的产生常伴随着电池片的隐裂出现。现有技术中,EVA胶膜的配方中含有交联剂、主交联剂、抗氧剂、偶联剂等助剂,其中通常使用过氧化物类物质作为交联剂引发EVA树脂的交联,过氧化物类交联剂是活性较高的引发剂,经过层压后仍有较多的交联剂残留于光伏组件内。
现有研究报告指出,蜗牛纹本身对光伏组件的功率衰减并无影响,这是由于蜗牛纹的面积只占据整个光伏组件中极小的部分,但随着时间的推移,蜗牛纹的大量产生势必会对光伏组件的稳定性产生影响。而通过对光伏组件蜗牛纹处的材料进行剥离剖析发现,蜗牛纹处的电池片没有变色情况,蜗牛纹变色位置总是位于银浆与EVA胶膜的交界处。由此推断,蜗牛纹的产生与EVA胶膜有直接的关系。
通过对蜗牛纹产生位置处的物质进行检测发现,蜗牛纹产生位置处的物质为碳酸银。由于常规EVA胶膜中残留的作为交联剂使用的过氧化物为叔丁基过氧化碳酸-2-乙基己酯(其分子结构如图1所示),而叔丁基过氧化碳酸-2-乙基己酯中含有羰基,当残留于光伏组件中的叔丁基过氧化碳酸-2-乙基己酯继续分解时会产生CO2,这些CO2透过EVA胶膜的背板面与透过电池片隐裂处的水汽结合,并与电池片上的银浆反应最终形成碳酸银,进而导致蜗牛纹的产生,降低了光伏组件质量的稳定性。
有鉴于此,确有必要对现有的EVA胶膜进行改进,以解决上述问题。
发明内容
本发明的目的在于提供一种抗蜗牛纹EVA胶膜,该抗蜗牛纹EVA胶膜可有效减少光伏组件中蜗牛纹的产生,保证光伏组件质量的稳定性。
为实现上述发明目的,本发明提供了一种抗蜗牛纹EVA胶膜,其中,所述抗蜗牛纹EVA胶膜选用乙酸乙烯(VA)质量百分比为28~33%、熔融指数为22~28g/10min的EVA原料,所述EVA原料还包括以下组分(按质量百分比):
作为本发明的进一步改进,所述EVA原料还包括质量百分比为0.1~0.3%的疏水剂。
作为本发明的进一步改进,所述疏水剂为聚硅氧烷。
作为本发明的进一步改进,所述主交联剂为含有双叔丁基过氧化环己烷结构、半衰期温度为95~130℃/h的有机物。
作为本发明的进一步改进,所述主交联剂为1,1-双叔丁基过氧化环己烷或1,1-双叔丁基过氧化-3,3,5-三甲基环己烷。
作为本发明的进一步改进,所述助交联剂为三烯丙基异氰脲酸酯。
作为本发明的进一步改进,所述助交联剂为三羟甲基丙烷三甲基丙烯酸酯。
作为本发明的进一步改进,所述光稳定剂为癸二酸双-2,2,6,6-四甲基哌啶醇酯。
作为本发明的进一步改进,所述偶联剂为γ-(甲基丙烯酰氧)丙基三甲氧基硅烷。
作为本发明的进一步改进,所述抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯。
本发明的有益效果在于:本发明的抗蜗牛纹EVA胶膜通过调整EVA胶膜生产过程中EVA原料的组分及交联剂的类型,可从根本上解决因交联剂残留造成的蜗牛纹,提高了光伏组件使用的稳定性。
附图说明
图1为现有技术中交联剂叔丁基过氧化碳酸-2-乙基己酯的分子结构示意图。
图2为本发明中主交联剂1,1-双叔丁基过氧化-3,3,5-三甲基环己烷的分子结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚,下面结合附图和具体实施例对本发明进行详细描述。
本发明提供了一种抗蜗牛纹EVA胶膜,其中,所述抗蜗牛纹EVA胶膜选用乙酸乙烯(VA)质量百分比为28~33%、熔融指数为22~28g/10min的EVA原料。
所述EVA原料还包括质量百分比为0.5~0.8%的主交联剂,本实施例中,所述主交联剂选用含有双叔丁基过氧化环己烷结构、半衰期温度为95~130℃/h的有机物。优选的,所述主交联剂为1,1-双叔丁基过氧化环己烷或1,1-双叔丁基过氧化-3,3,5-三甲基环己烷。
以下将以1,1-双叔丁基过氧化-3,3,5-三甲基环己烷作为主交联剂进行举例说明。请参见图1及图2,图1为现有技术中所使用的主交联剂叔丁基过氧化碳酸-2-乙基己酯的分子结构式,从图1可以看出:该叔丁基过氧化碳酸-2-乙基己酯的分子结构中包含有羰基1,所述羰基1的分解产物为CO2,与经电池片隐裂而进入光伏组件中的水汽反应生成碳酸,并进一步与光伏组件中的银浆发生反应而生成碳酸银,从而导致蜗牛纹的产生。
图2为本实施例采用的主交联剂1,1-双叔丁基过氧化-3,3,5-三甲基环己烷的分子结构式,从图2中可以看出:该1,1-双叔丁基过氧化-3,3,5-三甲基环己烷的分子结构中不含有羰基1,因此当1,1-双叔丁基过氧化-3,3,5-三甲基环己烷作为主交联剂残存于光伏组件中时,继续分解的产物中不会有CO2,从而杜绝了碳酸银的生成,避免在光伏组件中产生蜗牛纹。
与现有技术中的交联剂叔丁基过氧化碳酸-2-乙基己酯相比,本发明中的主交联剂1,1-双叔丁基过氧化环己烷和1,1-双叔丁基过氧化-3,3,5-三甲基环己烷在与EVA原料中的其他物质发生反应时,反应速度更快,在相同的层压工艺下,层压后残留的主交联剂更少,交联效率更高。
所述EVA原料还包括质量百分比为0.4~0.8%的助交联剂,所述助交联剂可以为三烯丙基异氰脲酸酯,也可以为三羟甲基丙烷三甲基丙烯酸酯。
所述EVA原料还包括质量百分比为0.1~0.3%的光稳定剂,优选的,所述光稳定剂为癸二酸双-2,2,6,6-四甲基哌啶醇酯。
所述EVA原料还包括质量百分比为0.1~0.5%的偶联剂,优选的,所述偶联剂为γ-(甲基丙烯酰氧)丙基三甲氧基硅烷。
所述EVA原料还包括质量百分比为0.1~0.3%的抗氧剂,优选的,所述抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯。
所述EVA原料还包括质量百分比为0.1~0.3%的疏水剂,优选的,所述疏水剂为聚硅氧烷。所述疏水剂的加入,可以阻止水汽透过背板面而与交联剂的分解产物发生反应,在避免蜗牛纹产生的同时进一步保护封装材料的绝缘性能,更好的保护光伏组件的正常发电,提高光伏组件质量的稳定性。
综上所述,本发明通过使用含有双叔丁基过氧化环己烷结构的有机物作为EVA胶膜生产所需的主交联剂,从而避免了CO2的产生,从根本上杜绝了光伏组件中蜗牛纹的产生,保证了光伏组件质量的稳定性。同时,在EVA胶膜生产原料中加入疏水剂,可以阻止水汽穿过EVA胶膜的背板面,保护封装材料的绝缘性能,从而进一步保证光伏组件的正常发电。
以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围。

Claims (10)

1.一种抗蜗牛纹EVA胶膜,其特征在于:所述抗蜗牛纹EVA胶膜选用乙酸乙烯(VA)质量百分比为28~33%、熔融指数为22~28g/10min的EVA原料,所述EVA原料还包括以下组分(按质量百分比):
2.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述EVA原料还包括质量百分比为0.1~0.3%的疏水剂。
3.根据权利要求2所述的抗蜗牛纹EVA胶膜,其特征在于:所述疏水剂为聚硅氧烷。
4.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述主交联剂为含有双叔丁基过氧化环己烷结构、半衰期温度为95~130℃/h的有机物。
5.根据权利要求4所述的抗蜗牛纹EVA胶膜,其特征在于:所述主交联剂为1,1-双叔丁基过氧化环己烷或1,1-双叔丁基过氧化-3,3,5-三甲基环己烷。
6.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述助交联剂为三烯丙基异氰脲酸酯。
7.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述助交联剂为三羟甲基丙烷三甲基丙烯酸酯。
8.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述光稳定剂为癸二酸双-2,2,6,6-四甲基哌啶醇酯。
9.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述偶联剂为γ-(甲基丙烯酰氧)丙基三甲氧基硅烷。
10.根据权利要求1所述的抗蜗牛纹EVA胶膜,其特征在于:所述抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯。
CN201611215046.0A 2016-12-26 2016-12-26 抗蜗牛纹eva胶膜 Pending CN108239486A (zh)

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