CN107819050A - 一种太阳能电池散热背板结构及其加工工艺 - Google Patents
一种太阳能电池散热背板结构及其加工工艺 Download PDFInfo
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Abstract
本发明涉及一种太阳能电池散热背板结构及其加工工艺,属于电池装备技术领域。本发明针对太阳能电池背板需要具有良好散热性的要求,设计了一种新型的背板结构,它主要是通过在PET基材层与胶水层制备时采用了表面粗糙化处理手段,同时对胶水层的配方进行处理,通过单体聚合效果将导热颗粒导入粗糙化的PET表层中,实现了PET基材层与胶水层之间的导热效果。
Description
技术领域
本发明涉及一种太阳能电池散热背板结构及其加工工艺,属于电池装备技术领域。
背景技术
太阳能电池背板位于组件背面的最外层,在户外环境下保护太阳能电池组件不受水汽的侵蚀,阻隔氧气防止氧化、耐高低温、良好的绝缘性和耐老化性能、耐腐蚀性能,可以反射阳光,提高组件的转化效率,具有较高的红外发射率,可以降低组件的温度。太阳能电池背板位于太阳能电池板的背面,对电池片起保护和支撑作用,具有可靠的绝缘性、阻水性、耐老化性。一般具有三层结构,外层保护层具有良好的抗环境侵蚀能力(防止水气侵蚀、抗紫外线等),中间层为PET聚脂薄膜(聚对苯二甲酸乙二醇酯)具有良好的绝缘性能和强度,内层薄膜PEVA或PE与EVA胶膜具有良好的粘接性能。
2.PET:是聚对苯二甲酸乙二醇酯的简称,又称聚酯薄膜,乳白色或浅黄色、高度结晶的聚合物,表面平滑有光泽。具有优良的物理机械性能,长期使用温度可达120℃,短期使用可耐150℃高温,可耐-70℃低温,且高、低温时对其机械性能影响很小。电绝缘性优良,甚至在高温高频下,其电性能仍较好,抗蠕变性、耐疲劳性、耐摩擦性、尺寸稳定性都很好。气体和水蒸气渗透率低,但是在高温高湿中容易水解,在紫外光照下易发生光降解反应。背板一般都用PET膜来作为支持体。由多层PET复合而成的背板也有一定的市场应用。
例如:专利CN104409547A公开了一种太阳能电池背板,在PET层上通过胶水粘接有铝箔层,但是由于胶水的存在,导致了PET层与铝箔层之间的热传输效率不好。
发明内容
本发明的目的是:针对太阳能电池背板需要具有良好散热性的要求,设计了一种新型的背板结构,它主要是通过在PET基材层与胶水层制备时采用了表面粗糙化处理手段,同时对胶水层的配方进行处理,通过单体聚合效果将导热颗粒导入粗糙化的PET表层中,实现了PET基材层与胶水层之间的导热效果。同时,本发明还提出了一种新颖的加工制造背板的方法。
技术方案是:
一种太阳能电池散热背板结构,包括有PET基层,在其一侧依次排布有胶水层、铝箔层和含氟聚合物层;PET基层中分散有纳米纤维,胶水层中分散有导热颗粒。
所述的导热颗粒是改性氧化钛。
所述的纳米纤维是指PA6纳米纤维。
含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的1~5%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,再加入混合物重量1~5%的酰氯类单体和3~6%导热颗粒,得到胶水;
第3步,涂覆胶水:在第1步得到的PET基层的表面涂1~5wt%哌嗪类单体的水溶液,再将涂上第2步得到的胶水,静置至少4h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
所述的第2步中,环氧树脂胶与有机溶剂的重量比是10:1~2。
所述的第2步中,导热颗粒是改性氧化钛颗粒。
所述的改性氧化钛颗粒的制备方法是:按重量份计,将30~35份的钛酸四丁酯、5~10份硫酸钠和300~340份去离子水混合,再升温至75~85℃,滴加硫酸水溶液调节pH至4~6,降温至30~35℃后再加入羟基硅油35~50份,搅拌反应1~2h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
所述的第3步中,胶水的厚度是0.05~2mm。
所述的第4步中,热压法中的压力是0.1~1Mpa,温度是80~110℃。
上述制备方法上,第2步在胶水加入酰氯类单体的作用是利用界面聚合反应将胶水中的颗粒嵌入PET基层的粗糙化表面中,可以提高胶水层与PET基层之间的传热速度;第3步中在PET基因的表面加入含有哌嗪类单体的水溶液的作用是与胶水中的酰氯单体进行聚合反应;在胶水中加入导热颗粒的作用是提高胶水与PET基材之间的传热效果;对氧化钛颗粒进行改性的目的是提高其在胶水中的分散性,使它能够在粗糙表面上更容易被嵌入。
有益效果
本发明针对太阳能电池背板需要具有良好散热性的要求,设计了一种新型的背板结构,它主要是通过在PET基材层与胶水层制备时采用了表面粗糙化处理手段,同时对胶水层的配方进行处理,通过单体聚合效果将导热颗粒导入粗糙化的PET表层中,实现了PET基材层与胶水层之间的导热效果。
附图说明
图1是背板结构图。
图2是未经过粗糙化的PET表面电镜图;
图3是加入了纳米纤维后的PET表面电镜图,出现了明显的粗糙化效果;
其中,1、PET基材;2、胶水层;3、铝箔层;4、含氟聚合物层。
具体实施方式
实施例1
如图1所示的太阳能电池散热背板结构,包括有PET基层1,在其一侧依次排布有胶水层2、铝箔层3和含氟聚合物层4;PET基层1中分散有纳米纤维,胶水层2中分散有导热颗粒;所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的1%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
纳米纤维制备方法是:聚酰胺6(PA6)(相对粘度为2.8)切片溶于甲酸,搅拌3h至均匀黏稠状的溶液,质量分数为15%,制备出纺丝液。采用内径1.2mm针头,纺丝液进行静电纺丝制备PA6纳米纤维。采用纺丝电压为14KV,纺丝距离为10cm,自制平口针头置于水平偏下约15°。
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,环氧树脂胶与有机溶剂的重量比是10:1,再加入混合物重量1%的均苯三甲酰氯和3%改性氧化钛颗粒,得到胶水;所述的改性氧化钛颗粒的制备方法是:按重量份计,将30份的钛酸四丁酯、5份硫酸钠和300份去离子水混合,再升温至75℃,滴加硫酸水溶液调节pH至4,降温至30℃后再加入羟基硅油35份,搅拌反应1h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
第3步,涂覆胶水:在第1步得到的PET基层的表面涂1wt%无水哌嗪的水溶液,再将涂上第2步得到的胶水,胶水的厚度是0.05mm,静置6h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化,热压法中的压力是0.1Mpa,温度是80℃;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
实施例2
如图1所示的太阳能电池散热背板结构,包括有PET基层1,在其一侧依次排布有胶水层2、铝箔层3和含氟聚合物层4;PET基层1中分散有纳米纤维,胶水层2中分散有导热颗粒;所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的1~5%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
纳米纤维制备方法是:聚酰胺6(PA6)(相对粘度为2.8)切片溶于甲酸,搅拌3h至均匀黏稠状的溶液,质量分数为15%,制备出纺丝液。采用内径1.2mm针头,纺丝液进行静电纺丝制备PA6纳米纤维。采用纺丝电压为14KV,纺丝距离为10cm,自制平口针头置于水平偏下约15°。
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,环氧树脂胶与有机溶剂的重量比是10:2,再加入混合物重量5%的均苯三甲酰氯和6%改性氧化钛颗粒,得到胶水;所述的改性氧化钛颗粒的制备方法是:按重量份计,将35份的钛酸四丁酯、10份硫酸钠和340份去离子水混合,再升温至85℃,滴加硫酸水溶液调节pH至6,降温至35℃后再加入羟基硅油50份,搅拌反应2h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
第3步,涂覆胶水:在第1步得到的PET基层的表面涂5wt%无水哌嗪的水溶液,再将涂上第2步得到的胶水,胶水的厚度是2mm,静置6h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化,热压法中的压力是1Mpa,温度是110℃;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
实施例3
如图1所示的太阳能电池散热背板结构,包括有PET基层1,在其一侧依次排布有胶水层2、铝箔层3和含氟聚合物层4;PET基层1中分散有纳米纤维,胶水层2中分散有导热颗粒;所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的3%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
纳米纤维制备方法是:聚酰胺6(PA6)(相对粘度为2.8)切片溶于甲酸,搅拌3h至均匀黏稠状的溶液,质量分数为15%,制备出纺丝液。采用内径1.2mm针头,纺丝液进行静电纺丝制备PA6纳米纤维。采用纺丝电压为14KV,纺丝距离为10cm,自制平口针头置于水平偏下约15°。
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,环氧树脂胶与有机溶剂的重量比是10:2,再加入混合物重量3%的均苯三甲酰氯和5%改性氧化钛颗粒,得到胶水;所述的改性氧化钛颗粒的制备方法是:按重量份计,将32份的钛酸四丁酯、6份硫酸钠和320份去离子水混合,再升温至80℃,滴加硫酸水溶液调节pH至5,降温至32℃后再加入羟基硅油35~50份,搅拌反应1~2h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
第3步,涂覆胶水:在第1步得到的PET基层的表面涂2wt%无水哌嗪的水溶液,再将涂上第2步得到的胶水,胶水的厚度是0.4mm,静置6h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化,热压法中的压力是0.5Mpa,温度是90℃;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
对照例1
与实施例3的区别在于:未在PET颗粒中加入纳米纤维。
如图1所示的太阳能电池散热背板结构,包括有PET基层1,在其一侧依次排布有胶水层2、铝箔层3和含氟聚合物层4;PET基层1中分散有纳米纤维,胶水层2中分散有导热颗粒;所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒通过双向拉伸法制成PET基层薄膜;
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,环氧树脂胶与有机溶剂的重量比是10:2,再加入混合物重量3%的均苯三甲酰氯和5%改性氧化钛颗粒,得到胶水;所述的改性氧化钛颗粒的制备方法是:按重量份计,将32份的钛酸四丁酯、6份硫酸钠和320份去离子水混合,再升温至80℃,滴加硫酸水溶液调节pH至5,降温至32℃后再加入羟基硅油35~50份,搅拌反应1~2h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
第3步,涂覆胶水:在第1步得到的PET基层的表面涂2wt%无水哌嗪的水溶液,再将涂上第2步得到的胶水,胶水的厚度是0.4mm,静置6h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化,热压法中的压力是0.5Mpa,温度是90℃;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
第1步中得到的PET基材表面如图1所示,由于未加入纳米纤维,具有较高的平整度;而实施例3中得到的掺杂纤维PET基材,具有较高的粗糙度。
对照例2
与实施例3的区别在于:未在胶水中加入酰氯类单体。
如图1所示的太阳能电池散热背板结构,包括有PET基层1,在其一侧依次排布有胶水层2、铝箔层3和含氟聚合物层4;PET基层1中分散有纳米纤维,胶水层2中分散有导热颗粒;所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的3%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
纳米纤维制备方法是:聚酰胺6(PA6)(相对粘度为2.8)切片溶于甲酸,搅拌3h至均匀黏稠状的溶液,质量分数为15%,制备出纺丝液。采用内径1.2mm针头,纺丝液进行静电纺丝制备PA6纳米纤维。采用纺丝电压为14KV,纺丝距离为10cm,自制平口针头置于水平偏下约15°。
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,环氧树脂胶与有机溶剂的重量比是10:2,再加入混合物重量5%的改性氧化钛颗粒,得到胶水;所述的改性氧化钛颗粒的制备方法是:按重量份计,将32份的钛酸四丁酯、6份硫酸钠和320份去离子水混合,再升温至80℃,滴加硫酸水溶液调节pH至5,降温至32℃后再加入羟基硅油35~50份,搅拌反应1~2h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
第3步,涂覆胶水:在第1步得到的PET基层的表面涂2wt%无水哌嗪的水溶液,再将涂上第2步得到的胶水,胶水的厚度是0.4mm,静置6h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化,热压法中的压力是0.5Mpa,温度是90℃;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
对照例3
与实施例3的区别在于:未在胶水中加入纳米颗粒。
如图1所示的太阳能电池散热背板结构,包括有PET基层1,在其一侧依次排布有胶水层2、铝箔层3和含氟聚合物层4;PET基层1中分散有纳米纤维,胶水层2中分散有导热颗粒;所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
上述太阳能电池散热背板结构的制备方法,包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的3%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
纳米纤维制备方法是:聚酰胺6(PA6)(相对粘度为2.8)切片溶于甲酸,搅拌3h至均匀黏稠状的溶液,质量分数为15%,制备出纺丝液。采用内径1.2mm针头,纺丝液进行静电纺丝制备PA6纳米纤维。采用纺丝电压为14KV,纺丝距离为10cm,自制平口针头置于水平偏下约15°。
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,环氧树脂胶与有机溶剂的重量比是10:2,再加入混合物重量3%的均苯三甲酰氯,得到胶水;
第3步,涂覆胶水:在第1步得到的PET基层的表面涂2wt%无水哌嗪的水溶液,再将涂上第2步得到的胶水,胶水的厚度是0.4mm,静置6h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化,热压法中的压力是0.5Mpa,温度是90℃;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
从上表中可以看出,本发明制备得到的太阳能背板具有较好的散热性,其导热系数较大;实施例3与对照例1中PET基材表面的粗糙度由于掺杂纳米纤维的不同而发生改变,实施例3中由于对其表面粗糙化处理之后,在胶水中加入导热颗粒后能较好的提高表面的传热性,提高PET板与胶水之间的导热性。对照例2与实施例3相比可以看出,通过在胶水中加入酰氯类单体可以实现在胶水表面与PET基材表面的较好聚合,提高纳米颗粒的嵌入程度,使导热率提高;实施例3与对照例3相比,可以看出,纳米颗粒的加入具有提高导热的效果。
Claims (7)
1.一种太阳能电池散热背板结构,包括有PET基层,在其一侧依次排布有胶水层、铝箔层和含氟聚合物层;其特征在于:PET基层中分散有纳米纤维,胶水层中分散有导热颗粒。
2.根据权利要求1所述的太阳能电池散热背板结构,其特征在于:所述的导热颗粒是改性氧化钛;所述的纳米纤维是指PA6纳米纤维;含氟聚合物层是指PVDF薄膜。
3.权利要求1所述的太阳能电池散热背板结构的制备方法,其特征在于:包括如下步骤:
第1步,PET基层的制备:将PET颗粒与纳米纤维混合,纳米纤维的重量是PET颗粒重量的1~5%,通过挤出机共混挤出,再通过双向拉伸法制成PET基层薄膜;
第2步,胶水的制备:将环氧树脂胶与有机溶剂混合,再加入混合物重量1~5%的酰氯类单体和3~6%导热颗粒,得到胶水;
第3步,涂覆胶水:在第1步得到的PET基层的表面涂1~5wt%哌嗪类单体的水溶液,再将涂上第2步得到的胶水,静置至少4h进行表面聚合反应;
第4步,铝箔层的制备:将铝箔层压于胶水层上,通过热压法使环氧树脂胶水固化;
第5步,含氟聚合物层的制备:将含氟聚合物层热压于铝箔层上。
4.权利要求1所述的太阳能电池散热背板结构的制备方法,其特征在于:包括如下步骤:所述的第2步中,环氧树脂胶与有机溶剂的重量比是10:1~2,导热颗粒是改性氧化钛颗粒。
5.权利要求4所述的太阳能电池散热背板结构的制备方法,其特征在于:包括如下步骤:所述的改性氧化钛颗粒的制备方法是:按重量份计,将30~35份的钛酸四丁酯、5~10份硫酸钠和300~340份去离子水混合,再升温至75~85℃,滴加硫酸水溶液调节pH至4~6,降温至30~35℃后再加入羟基硅油35~50份,搅拌反应1~2h,将固体物滤出后,依次用乙醇、去离子清洗,得到改性改性氧化钛颗粒。
6.权利要求1所述的太阳能电池散热背板结构的制备方法,其特征在于:包括如下步骤:所述的第3步中,胶水的厚度是0.05~2mm。
7.权利要求1所述的太阳能电池散热背板结构的制备方法,其特征在于:包括如下步骤:所述的第4步中,热压法中的压力是0.1~1Mpa,温度是80~110℃。
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